How can I resolve these build errors in an empty project?

Development Platform & Builds
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1

I made the FPS tutorial and at the point where i spawn an actor for shooting i got this build errors. i then commented everything out. so now i got multiple empty classes but the compile error still stays. Maybe Engine.h or something important is missing? When i build other projects it is working but this is not a real solution. to make a new project and move everything from one to another…

1>------ Build started: Project: cpp_test_blank, Configuration: DebugGame_Editor x64 ------
1> Parsing headers for cpp_test_blankEditor
1> Code generation finished for cpp_test_blankEditor and took 1,738
1> PCH.cpp_test_blank.cpp_test_blank.h.cpp
1>C:\Program Files\Unreal Engine\4.1\Engine\Source\Runtime\CoreUObject\Public\UObject\ObjectBase.h(444): error C2079: ‘FReferencerInformation::ReferencingProperties’ uses undefined class ‘TArray’
1>C:\Program Files\Unreal Engine\4.1\Engine\Source\Runtime\CoreUObject\Public\UObject\ObjectBase.h(452): error C2079: ‘FReferencerInformationList::InternalReferences’ uses undefined class ‘TArray’
1>C:\Program Files\Unreal Engine\4.1\Engine\Source\Runtime\CoreUObject\Public\UObject\ObjectBase.h(453): error C2079: ‘FReferencerInformationList::ExternalReferences’ uses undefined class ‘TArray’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2065: ‘UClass’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2065: ‘Class’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2065: ‘InOuter’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2275: ‘UObject’ : illegal use of this type as an expression
1> C:\Program Files\Unreal Engine\4.1\Engine\Source\Runtime\Core\Public\Misc\DateTime.h(10) : see declaration of ‘UObject’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2065: ‘FName’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2146: syntax error : missing ‘)’ before identifier ‘InName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(22): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(34): error C2065: ‘UClass’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(34): error C2065: ‘ObjectClass’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(34): error C2065: ‘FName’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(34): error C2146: syntax error : missing ‘)’ before identifier ‘ObjectName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(34): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectHash.h(52): error C2061: syntax error : identifier ‘FName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(10): error C2065: ‘LogUObjectGlobals’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(10): error C2065: ‘Log’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(10): error C2065: ‘All’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(10): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(10): error C2491: ‘DECLARE_LOG_CATEGORY_EXTERN’ : definition of dllimport data not allowed
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(10): error C2078: too many initializers
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(12): error C2065: ‘STAT_ConstructObject’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(12): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(12): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(13): error C2065: ‘STAT_AllocateObject’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(13): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(13): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(14): error C2065: ‘STAT_PostConstructInitializeProperties’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(14): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(14): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(15): error C2065: ‘STAT_LoadConfig’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(15): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(15): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(16): error C2065: ‘STAT_LoadObject’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(16): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(16): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(17): error C2065: ‘STAT_FindObject’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(17): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(17): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(18): error C2065: ‘STAT_FindObjectFast’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(18): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(18): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(19): error C2065: ‘STAT_InitProperties’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(19): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(19): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(20): error C2065: ‘STAT_NameTableEntries’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(20): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(20): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(21): error C2065: ‘STAT_NameTableAnsiEntries’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(21): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(21): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(22): error C2065: ‘STAT_NameTableWideEntries’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(22): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(22): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(23): error C2065: ‘STAT_NameTableMemorySize’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(23): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(23): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(24): error C2065: ‘STAT_DestroyObject’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(24): error C2065: ‘STATGROUP_Object’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(24): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(30): error C2065: ‘STAT_NetSerializeFast_Array’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(30): error C2065: ‘STATGROUP_ServerCPU’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(30): error C2059: syntax error : ‘__declspec(dllimport)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(37): error C2065: ‘FFrame’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(37): error C2065: ‘TheStack’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(37): error C2065: ‘RESULT_DECL’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(37): error C2182: ‘Native’ : illegal use of type ‘void’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(37): error C2513: 'int UObject::* ’ : no variable declared before ‘=’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(59): error C2065: ‘TInlineAllocator’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(59): error C2974: ‘TArray’ : invalid template argument for ‘Allocator’, type expected
1> C:\Program Files\Unreal Engine\4.1\Engine\Source\Runtime\Core\Public\Core.h(16) : see declaration of ‘TArray’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(59): warning C4091: 'extern ’ : ignored on left of ‘TArray’ when no variable is declared
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(59): error C2143: syntax error : missing ‘;’ before ‘>’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(59): error C2059: syntax error : ‘>’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(87): error C2146: syntax error : missing ‘;’ before identifier ‘DestName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(87): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(119): error C2143: syntax error : missing ‘;’ before ‘<’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(119): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(119): error C2238: unexpected token(s) preceding ‘;’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(126): error C2143: syntax error : missing ‘;’ before ‘<’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(126): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(126): error C2238: unexpected token(s) preceding ‘;’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(136): error C2143: syntax error : missing ‘;’ before ‘’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(136): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(153): error C2061: syntax error : identifier ‘FName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(186): error C2061: syntax error : identifier ‘UPackageMap’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(187): error C2061: syntax error : identifier ‘UPackageMap’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(205): error C2061: syntax error : identifier ‘FName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(240): error C2065: ‘GLog’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(251): error C2143: syntax error : missing ‘;’ before '’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(251): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(251): error C2065: ‘InOuter’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(251): error C2059: syntax error : ‘const’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(258): error C2065: ‘FLoadPackageAsyncDelegate’ : undeclared identifier
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(258): error C2059: syntax error : ‘const’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(270): error C2143: syntax error : missing ‘;’ before ‘&’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(270): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(270): error C2061: syntax error : identifier ‘FLoadPackageAsyncDelegate’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(281): error C2143: syntax error : missing ‘;’ before ‘&’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(281): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(281): error C2061: syntax error : identifier ‘FName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(329): error C2146: syntax error : missing ‘;’ before identifier ‘MakeUniqueObjectName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(329): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(329): error C2061: syntax error : identifier ‘FName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(341): error C2146: syntax error : missing ‘;’ before identifier ‘MakeObjectNameFromActorLabel’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(341): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(341): error C2146: syntax error : missing ‘,’ before identifier ‘CurrentObjectName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(359): error C2146: syntax error : missing ‘)’ before identifier ‘ExcludeType’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(359): error C2182: ‘FlushAsyncLoading’ : illegal use of type ‘void’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(359): error C2491: ‘FlushAsyncLoading’ : definition of dllimport data not allowed
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(359): error C2059: syntax error : ‘)’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(403): error C2061: syntax error : identifier ‘FName’
1>c:\program files\unreal engine\4.1\engine\source\runtime\coreuobject\public\uobject\UObjectGlobals.h(403): fatal error C1003: error count exceeds 100; stopping compilation
1> -------- End Detailed Actions Stats -----------------------------------------------------------
1>ERROR : UBT error : Failed to produce item: E:\UNREAL_TEST\cpp_test_blank\Binaries\Win64\UE4Editor-cpp_test_blank-Win64-DebugGame.dll
1> Cumulative action seconds (8 processors): 0,00 building projects, 0,30 compiling, 0,00 creating app bundles, 0,00 generating debug info, 0,00 linking, 0,00 other
1> UBT execution time: 5,18 seconds
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.MakeFile.Targets(38,5): error MSB3073: The command ““C:\Program Files\Unreal Engine\4.1\Engine\Build\BatchFiles\Build.bat” cpp_test_blankEditor Win64 DebugGame “E:\UNREAL_TEST\cpp_test_blank\cpp_test_blank.uproject” -rocket” exited with code -1.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

2

update:
when i create a new blank project and try to compile it. i get the same error as posted above…

3

Looks like engines header files are broken, try to reinstall the engine (you can try “verify”) and regenerate project file

4

update is compile in VS2013 with new projects is only working in VS. Compile in Editor gives the above errors. I download engine again :slight_smile: maybe i broke something.

5

i uninstalled everything. downloaded and installed engine & launcher again.
loaded the project and got the same errors. i created a new project and migrated source files to new project and it is working.

So for me it is obviously project related. is there a way to somehow reset a project or its settings… so that the source and the levels could stay?

6

problem showing up again. When i hit BUILD->Rebuild Solution. The Errors show up again. my computer doesnt like me :<

7

I tried “verify” option but that doesn’t solve it.

8

Well compile button in editor is kind of buggy right now

9

So the solution atm is uninstall engine and launcher. reboot. install everything again and dont hit rebuild in VS.
answer is from :slight_smile:

10

I’m experiencing the same thing now as soon as I moved over to 4.2 :frowning:

11

Ok never mind. I found my error. I accidentally included a file above my “Engine.h” in the “MyProject.h” file, oops :slight_smile:

12

Fix a build error
When you build the rulebase any errors or warnings that are detected will be automatically logged in the Error List. Using this list you can see the type of error/warning ( build warning, build error, model warning, model error) and a description of the error. Where relevant, the file that the problem has occurred in will also be listed.

There are two checks that are always performed when you build the rulebase:

a check for multiply proven attributes, and
a check for logical loops.
There are a couple of other optional checks that can be performed when you build the rulebase. See Build a rulebase for more information.

To fix a build error, select the error in the Error List and double-click it. If the error relates to:

a multiply proven attribute, the Rule Browser will be shown. This view lists all the proving rules for the attribute and allows you to navigate easily to the rules within Word or Excel in order to fix them (either by using rule fragments, or by making the attributes not multiply proven). An attribute which is proven by multiple rules, where these rules are not tagged as rule fragments, will not function correctly in the Engine because of the operation of the automatic alternate conclusion in every rule. That is, the closed logic of alternative conclusions will prevent both rules being traversed - the first traversed will close off the possibility of the other form operating.
logical loops, the Logical Loop Check report will be shown. A Logical Loop Check report generates a list of any undefined self-referential rules, ie where an attribute is proved by itself and not defined as a rule loop, in the entire project. The Attribute Chain column in this report shows the chain of connections between attributes resulting in the self-reference. The Participating Rules column shows each of the rules involved in the loop. Generally, loops do not occur in single rules (eg x if x) but more commonly in highly nested layers of rules. Having self-referential rules has the result that those rules can never be fully proved. That is, the rule will repeatedly undergo a question search down the looping branch, cycling endlessly and never locating a base attribute within it. Use this report to identify the loop and then rectify it in your rules. If you are sure that the logic you need to model requires a loop in your rules, you may define the rules as rule loops.
an attribute needing a public name, the xgen file for that attribute will be shown. You will need to add a public name for that attribute in the associated properties file. To do this, select the attribute in the attributes list in the xgen file, right-click and choose Create Public Name In and your properties file from the pop-up menu.

To save a copy of the list of errors:

Right-click anywhere in the Error List window.
Select Copy List.
Open Microsoft Excel or Word (or another authoring tool) and paste the list.
Save the list.

Regards,