Unable to Build or Clean after upgrading from 4.16 to 4.19

Development Pipeline & Plugins
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1

Hello all!
We are updating our project from 4.16 to 4.19, and are encountering an error when we try to build or clean the solution.

This error occurs when Cleaning:

1>------ Clean started: Project: ProjectName, Configuration: Development_Editor x64 ------
1>  Cleaning ProjectNameEditor Binaries...
1>UnrealBuildTool : error : Unable to clean target while hot-reloading. Close the editor and try again.
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(36,5): error MSB3073: The command ""C:\Program Files\Epic Games\UE_4.19\Engine\Build\BatchFiles\Clean.bat" ProjectNameEditor Win64 Development "E:\repo\ProjectName\ProjectName.uproject" -WaitMutex -FromMsBuild" exited with code -1.
========== Clean: 0 succeeded, 1 failed, 0 skipped ==========

And this one comes up when we try to build:

1>------ Build started: Project: ProjectName, Configuration: Development_Editor x64 ------
1>  Creating makefile for hot reloading ProjectNameEditor (no existing makefile)
1>  Compiling game modules for hot reload
1>  Performing full C++ include scan (no include cache file)
1>  Parsing headers for ProjectNameEditor
1>    Running UnrealHeaderTool "E:\repo\ProjectName\ProjectName.uproject" "E:\repo\ProjectName\Intermediate\Build\Win64\ProjectNameEditor\Development\ProjectNameEditor.uhtmanifest" -LogCmds="loginit warning, logexit warning, logdatabase error" -Unattended -WarningsAsErrors -installed
1>E:/repo/ProjectName/Source/ProjectName/ProjectNamePawn.h(41): error : Unrecognized type 'UDestructibleComponent' - type must be a UCLASS, USTRUCT or UENUM
1>EXEC : error : UnrealHeaderTool failed for target 'ProjectNameEditor' (platform: Win64, module info: E:\repo\ProjectName\Intermediate\Build\Win64\ProjectNameEditor\Development\ProjectNameEditor.uhtmanifest, exit code: OtherCompilationError (5)).
1>C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V140\Microsoft.MakeFile.Targets(41,5): error MSB3075: The command ""C:\Program Files\Epic Games\UE_4.19\Engine\Build\BatchFiles\Build.bat" ProjectNameEditor Win64 Development "E:\repo\ProjectName\ProjectName.uproject" -WaitMutex -FromMsBuild" exited with code 5. Please verify that you have sufficient rights to run this command.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Any ideas?

2

Can you post the line 41 of ProjectNamePawn.h?

3

error : Unable to clean target while hot-reloading. Close the editor and try again.

Looks like your clean was prevented by having the editor open.

You may have to include some destructible things in your pawn header and add the module to your build CS

4

Thank you, I had a look at the project’s C# files and I just copy pasted the contents of the build files of a fresh 4.19 project (changing names and such). Also removed the destructible stuff because I don’t need it. Cleans with no issues now! Cheers.

5

That was the line with a declaration for a destructible component. Removing it (it’s unused) fixed the issue, among other things.