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UE 4.18 don't open

When I open UE 4.18, on 35% loading it crash. Yesterday it open normally, but today his don't open, and print that log.

Assertion failed: A.ArrayNum >= 0 [File:d:\build\++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\Containers/Array.h] [Line: 1075]

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:414] UE4Editor_DerivedDataCache!operator<<() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\public\containers\array.h:1076] UE4Editor_DerivedDataCache!FMemoryDerivedDataBackend::LoadCache() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\memoryderiveddatabackend.cpp:249] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseBootCache() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:628] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:153] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseHierarchicalCache() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:425] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:169] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseAsyncPut() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:336] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:185] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseKeyLength() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:377] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::ParseNode() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:173] UE4Editor_DerivedDataCache!FDerivedDataBackendGraph::FDerivedDataBackendGraph() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:90] UE4Editor_DerivedDataCache!FDerivedDataBackend::Get() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatabackends.cpp:905] UE4Editor_DerivedDataCache!FDerivedDataCache::FDerivedDataCache() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatacache.cpp:239] UE4Editor_DerivedDataCache!FDerivedDataCacheWithRollups::FDerivedDataCacheWithRollups() UE4Editor_DerivedDataCache!InternalSingleton() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatacache.cpp:1044] UE4Editor_DerivedDataCache!FDerivedDataCacheModule::StartupModule() [d:\build++ue4+release-4.18+compile\sync\engine\source\developer\deriveddatacache\private\deriveddatacache.cpp:1069] UE4Editor_Core!FModuleManager::LoadModuleWithFailureReason() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\modules\modulemanager.cpp:505] UE4Editor_Core!FModuleManager::LoadModule() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\modules\modulemanager.cpp:338] UE4Editor_Core!GetDerivedDataCache() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\coremisc.cpp:98] UE4Editor_Core!GetDerivedDataCacheRef() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\core\private\misc\coremisc.cpp:109] UE4Editor_Engine!CompileGlobalShaderMap() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\engine\private\shadercompiler\shadercompiler.cpp:3777] UE4Editor!FEngineLoop::PreInit() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:1780] UE4Editor!GuardedMain() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\launch.cpp:127] UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.18+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:134] UE4Editor!WinMain() [d:\build++ue4+release-4.18+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

Product Version: UE 4.18
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asked Nov 27 '17 at 04:03 PM in Using UE4

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XAHTER_
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avatar image amoo 4k5_ Jul 29 '18 at 06:05 AM

I have the same problem no one answers me

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Try deleting the DerivedDataCache directory from your project folder. It will take time to rebuild but it might get past the issue.

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answered Nov 27 '17 at 10:36 PM

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Jin_VE
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