Unreal Engine 4.19.1 won't start

Development Platform & Builds
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1

After pressing launch the loading screen starts and after 9% I get a crash report.

I tried verifing and reinstalling the engine. I dont have any projects in the “Unreal Projects” dircetory.
I downloaded an older version (4.12) wich works perfectly fine.

Crash Report:
LoginId:e99b129147655d76a62e19bf3b17e5a5
EpicAccountId:0063a871d3144d28a42e086fd6ee5152

Assertion failed: SerializeNum >= 0 [File:d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\Containers/Array.h] [Line: 1078]

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:419]
UE4Editor_DerivedDataCache!operator<<() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\public\containers\array.h:1078]
UE4Editor_DerivedDataCache!FMemoryDerivedDataBackend::LoadCache() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\memoryderiveddatabackend.cpp:249]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseBootCache() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:635]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:154]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseHierarchicalCache() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:426]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:170]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseAsyncPut() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:337]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:186]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseKeyLength() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:378]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:174]
UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::FDerivedDataBackendGraph() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:91]
UE4Editor_DerivedDataCache!FDerivedDataBackend::Get() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:922]
UE4Editor_DerivedDataCache!FDerivedDataCache::FDerivedDataCache() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatacache.cpp:240]
UE4Editor_DerivedDataCache!FDerivedDataCacheWithRollups::FDerivedDataCacheWithRollups()
UE4Editor_DerivedDataCache!InternalSingleton() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatacache.cpp:1060]
UE4Editor_DerivedDataCache!FDerivedDataCacheModule::StartupModule() [d:\build++ue4+release-4.19+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatacache.cpp:1085]
UE4Editor_Core!FModuleManager::LoadModuleWithFailureReason() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\modules\modulemanager.cpp:505]
UE4Editor_Core!FModuleManager::LoadModule() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\modules\modulemanager.cpp:338]
UE4Editor_Core!GetDerivedDataCache() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\coremisc.cpp:98]
UE4Editor_Core!GetDerivedDataCacheRef() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\core\private\misc\coremisc.cpp:109]
UE4Editor_Engine!CompileGlobalShaderMap() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:3946]
UE4Editor!FEngineLoop::PreInit() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:1817]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\launch.cpp:127]
UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134]
UE4Editor!WinMain() [d:\build++ue4+release-4.19+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:210]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:253]
kernel32
ntdll

Thanks,
Max

2

,Have you ever find a solution to this? I’m having the same issue line by line! thanks

3

hello fellas
i had this problem and my solution was to go to “C:\Users*user name*\AppData\Local\UnrealEngine”
then go to your engine version that crash and delete all the inside. and then open the engine.
daadaa!
hope you get it to work .