Unreal Engine 4 crashes trying to open project

Development World Creation
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1

My Unreal Engine 4 project has started crashing everytime I try and open it. I have tried on many computers with no luck (My main, the college computers and and older computer I dug out). It gets to about 96% loading on each machine and then gives up.
The project folder has gotten way bigger over the past few weeks (18GB) due to me essentially compiling together various versions of the project into one big feature epic for my college presentation.
I have an idea about what might be causing the problem: Because my Main computer has limited CDrive space, I regularly have to delete the files in DerrivedDataCache folder (Usually well over 8GB), but now when I check the folder size after a crash it’s only 3.86GB (on all computers). I think it’s failing to build the DerrivedDataCache.
Here are my crash logs:

MachineId:1CAE4902433E6F1AAD7F4BB649A9C68C
EpicAccountId:bd3a920784354ec3beba5d3887462705

Unknown exception - code 00000001 (first/second chance not available)

Assertion failed: FCompression::UncompressMemory( Flags, Dest, Chunk.UncompressedSize, CompressedBuffer, Chunk.CompressedSize, (Padding > 0) ? true : false ) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Runtime\Core\Pri

KERNELBASE + 40541 bytes
UE4Editor_Core!FOutputDeviceWindowsError::Serialize() + 292 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor_Core!FOutputDevice::Logf__VA() + 248 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor_Core!FDebug::AssertFailed() + 1079 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor_Core!FArchive::SerializeCompressed() + 961 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\serialization\archive.cpp:394]
UE4Editor_CoreUObject!FUntypedBulkData::SerializeBulkData() + 172 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\bulkdata.cpp:1009]
UE4Editor_CoreUObject!FUntypedBulkData::LoadDataIntoMemory() + 123 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\bulkdata.cpp:1113]
UE4Editor_CoreUObject!FUntypedBulkData::Lock() + 149 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\bulkdata.cpp:427]
UE4Editor_Engine!FTextureSource::GetMipData() + 88 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texture.cpp:645]
UE4Editor_Engine!FTextureCacheDerivedDataWorker::GetSourceMips() + 756 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texturederiveddata.cpp:834]
UE4Editor_Engine!FTextureCacheDerivedDataWorker::GetBuildInfo() + 431 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texturederiveddata.cpp:720]
UE4Editor_Engine!FTextureCacheDerivedDataWorker::Finalize() + 94 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texturederiveddata.cpp:910]
UE4Editor_Engine!FTexturePlatformData::FinishCache() + 202 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texturederiveddata.cpp:988]
UE4Editor_Engine!UTexture::FinishCachePlatformData() + 115 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texturederiveddata.cpp:1574]
UE4Editor_Engine!UTexture2D::PostLoad() + 64 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\texture2d.cpp:356]
UE4Editor_CoreUObject!UObject::ConditionalPostLoad() + 455 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\uobject\obj.cpp:628]
UE4Editor_CoreUObject!FAsyncPackage::PostLoadObjects() + 1324 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\asyncloading.cpp:844]
UE4Editor_CoreUObject!FAsyncPackage::Tick() + 848 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\asyncloading.cpp:349]
UE4Editor_CoreUObject!ProcessAsyncLoading() + 621 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\asyncloading.cpp:1111]
UE4Editor_CoreUObject!FlushAsyncLoading() + 239 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\coreuobject\private\serialization\asyncloading.cpp:1042]
UE4Editor_Engine!ULevelStreaming::RequestLevel() + 2885 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\levelstreaming.cpp:484]
UE4Editor_Engine!UWorld::UpdateLevelStreamingInner() + 497 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\world.cpp:2238]
UE4Editor_Engine!UWorld::UpdateLevelStreaming() + 592 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\world.cpp:2306]
UE4Editor_Engine!UWorld::FlushLevelStreaming() + 160 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\engine\private\world.cpp:2335]
UE4Editor_UnrealEd!UEditorEngine::Map_Load() + 7096 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editorserver.cpp:2333]
UE4Editor_UnrealEd!UEditorEngine::HandleMapCommand() + 349 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editorserver.cpp:5680]
UE4Editor_UnrealEd!UEditorEngine::Exec() + 797 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\editorserver.cpp:5180]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() + 273 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\unrealedsrv.cpp:742]
UE4Editor_UnrealEd!FEditorFileUtils::LoadMap() + 789 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\filehelpers.cpp:1910]
UE4Editor_UnrealEd!FEditorFileUtils::LoadDefaultMapAtStartup() + 216 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\filehelpers.cpp:3070]
UE4Editor_UnrealEd!FUnrealEdMisc::OnInit() + 2263 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\unrealedmisc.cpp:299]
UE4Editor_UnrealEd!EditorInit() + 3254 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\unrealed\private\unrealed.cpp:86]
UE4Editor!GuardedMain() + 926 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:133]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

2

Hi -

We have no reports of this particular crash before, but I think I can give some guidance to at least get the project back open again. First, it looks like something in your default map is causing the crash, so first thing copy the UMAP file that loads on opening to a new location (outside of the project) and delete it in the project, this alone should get you back in the project.

NOw, I would delete the Derived, Intermediate and Saved Subfolders and let your engine rebuild everything again. You talk about combine assets from various projects, have you been migrating them or merely copying them from Windows Explorer. If it’s from Windows Explorer, you could have some Redirector issues which you will need to dig through the project and find and correct.

Finally it looks like you are using a lot of level and texture streaming in the map file that is crashing the project, try to temporarily simplify the landscape material (even down to just a series of colors) and then copy that umap file back in your project in the same place you removed it form and close and open the engine again.

Thank You

Eric Ketchum