Unreal Crashing whenever I try to open anything after about a week of not using it.

Development Programming & Scripting
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1

After about a week of not working on the project, i attempted to open it and work on it. At first it crashed on startup so I deleted the Saved, Intermediate, and Config folders and then it opened, but now I cannot open any of the blueprints I created without it crashing. here is my error message.

Assertion failed: Index.IsExport() && ExportMap.IsValidIndex(Index.ToExport()) [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\Linker.h] [Line: 165]

UnrealEditor_CoreUObject!FLinkerLoad::FixupImportMap() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:1932]
UnrealEditor_CoreUObject!FLinkerLoad::ProcessPackageSummary() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:812]
UnrealEditor_CoreUObject!FLinkerLoad::Tick() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:932]
UnrealEditor_CoreUObject!FLinkerLoad::CreateLinker() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:550]
UnrealEditor_CoreUObject!GetPackageLinker() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Linker.cpp:875]
UnrealEditor_CoreUObject!LoadPackageInternal() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1718]
UnrealEditor_CoreUObject!FLinkerLoad::VerifyImportInner'::2’::<lambda_1>::operator()() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:3394]
UnrealEditor_CoreUObject!FLinkerLoad::VerifyImportInner() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:3529]
UnrealEditor_CoreUObject!FLinkerLoad::VerifyImport() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:3037]
UnrealEditor_CoreUObject!FLinkerLoad::Verify() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:2815]
UnrealEditor_CoreUObject!FLinkerLoad::FinalizeCreation() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:2617]
UnrealEditor_CoreUObject!FLinkerLoad::ProcessPackageSummary() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:882]
UnrealEditor_CoreUObject!FLinkerLoad::Tick() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:932]
UnrealEditor_CoreUObject!FLinkerLoad::CreateLinker() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\LinkerLoad.cpp:550]
UnrealEditor_CoreUObject!GetPackageLinker() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Linker.cpp:875]
UnrealEditor_CoreUObject!LoadPackageInternal() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1718]
UnrealEditor_CoreUObject!LoadPackage() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:2014]
UnrealEditor_CoreUObject!LoadPackage() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectGlobals.cpp:1987]
UnrealEditor_ContentBrowserAssetDataSource!FAssetData::FastGetAsset() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\AssetRegistry\AssetData.h:516]
UnrealEditor_ContentBrowserAssetDataSource!ContentBrowserAssetData::EditOrPreviewAssetFileItems() [D:\build++UE5\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataCore.cpp:361]
UnrealEditor_ContentBrowserAssetDataSource!ContentBrowserAssetData::EditOrPreviewItems() [D:\build++UE5\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataCore.cpp:417]
UnrealEditor_ContentBrowserAssetDataSource!UContentBrowserAssetDataSource::BulkEditItems() [D:\build++UE5\Sync\Engine\Plugins\Editor\ContentBrowser\ContentBrowserAssetDataSource\Source\ContentBrowserAssetDataSource\Private\ContentBrowserAssetDataSource.cpp:2200]
UnrealEditor_ContentBrowser!SContentBrowser::OnItemsActivated() [D:\build++UE5\Sync\Engine\Source\Editor\ContentBrowser\Private\SContentBrowser.cpp:3141]
UnrealEditor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SContentBrowser,1,void __cdecl(TArrayView<FContentBrowserItem const ,int>,enum EAssetTypeActivationMethod::Type),FDefaultDelegateUserPolicy>::Execute() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:281]
UnrealEditor_ContentBrowser!SAssetView::OnListMouseButtonDoubleClick() [D:\build++UE5\Sync\Engine\Source\Editor\ContentBrowser\Private\SAssetView.cpp:4081]
UnrealEditor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,1,void __cdecl(TSharedPtr<FAssetViewItem,1>),FDefaultDelegateUserPolicy>::ExecuteIfSafe() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:298]
UnrealEditor_ContentBrowser!TDelegate<void __cdecl(TSharedPtr<FAssetViewItem,1>),FDefaultDelegateUserPolicy>::ExecuteIfBound<void,0>() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateSignatureImpl.inl:570]
UnrealEditor_ContentBrowser!SListView<TSharedPtr<FAssetViewItem,1> >::Private_OnItemDoubleClicked() [D:\build++UE5\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\SListView.h:1122]
UnrealEditor_ContentBrowser!STableRow<TSharedPtr<FAssetViewItem,1> >::OnMouseButtonDoubleClick() [D:\build++UE5\Sync\Engine\Source\Runtime\Slate\Public\Widgets\Views\STableRow.h:423]
UnrealEditor_Slate!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FPointerEvent,FSlateApplication::RoutePointerDoubleClickEvent'::2’::<lambda_1> >() [D:\build++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:442]
UnrealEditor_Slate!FSlateApplication::RoutePointerDoubleClickEvent() [D:\build++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5700]
UnrealEditor_Slate!FSlateApplication::ProcessMouseButtonDoubleClickEvent() [D:\build++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5685]
UnrealEditor_Slate!FSlateApplication::OnMouseDoubleClick() [D:\build++UE5\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5648]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\build++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2235]
UnrealEditor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\build++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2738]
UnrealEditor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\build++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1099]
UnrealEditor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\build++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:937]
user32
user32
UnrealEditor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\build++UE5\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:148]
UnrealEditor!FEngineLoop::Tick() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:5749]
UnrealEditor!GuardedMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:188]
UnrealEditor!GuardedMainWrapper() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:118]
UnrealEditor!LaunchWindowsStartup() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:258]
UnrealEditor!WinMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:298]
UnrealEditor!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

Any ideas? I have tried searching around but none of the offered solutions have worked thus far.

2

Hey @Maxwell_Noodle!

Interesting as it’s saying it’s basically getting an index return of a value larger than a given index somewhere in the source code for the base Object class. (Line: 165)

Which tells me it’s something to do with the engine itself. Is this happening with every project? Try using the validator on the launcher!

Hope this helps, let us know!

3

I have used the validator. It doesn’t seem to happen on other projects. At some point I believe something may have happened to the drive this project is on and the UASSET files may have been corrupted in some way. Not sure how it happened. Either way It crashes only when opening my blueprints. I can open some of my other files just fine.

4

So, to be clear- It crashes when opening your CUSTOM blueprints that YOU have created, but what about other blueprints? Such as anything that may have been imported or came with the project template?

5

Sorry for the late reply. Those all seem to work fine. It is only my blueprints. I tried moving it to a newer version of unreal but that did not solve it either.

6

I found another thread where someone was having this specific issue, someone ended up finding a solution- let us know if this works for you! I know it says “4.27” but version probably doesn’t matter here.