Hello! I’ve encountered this twice, and it was supposedly resolved:
However, it seems to have returned. I have reproduced it 3 times so I’ll post steps below as well as callstack and whatnot:
- Create a new project, blank, blueprints, no starter content.\
- Create a pawn blueprint class. I’ll call it “main class” from this point.
- Create an actor blueprint class. I’ll call it “subactor” from this point.
- In main class, creat a child actor component.
- In the main class event graph, create an event dispatcher and call it on event begin play.
- In the subactor, on event begin play, get the attach parent of the sceneroot, get owner of that, and then cast that to main class.
- On cast succeed, bind that event dispatcher from the cast output to a custom event.
- In main class, make sure to set the child actor class to the subactor we created.
- Save the map, and save everything and close the editor.
- Restart the editor, and drag the main class into the map.
- Explode
Thank you so much!
I almost forgot, here’s the callstack and everything from the example used above:
Fatal error: [File:D:\Build++UE4+Release-4.14+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 11]
Cast of LinkerPlaceholderExportObject /Game/MainClass.MainClass_C:ChildActor_GEN_VARIABLE.ChildActor_GEN_VARIABLE_subactor_C_CAT to Actor failed
UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor_CoreUObject!CastLogError() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\templates\casts.cpp:12]
UE4Editor_Engine!CastChecked() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\public\templates\casts.h:203]
UE4Editor_Engine!UChildActorComponent::Serialize() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\components\childactorcomponent.cpp:91]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3414]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2890]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::CreateImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4257]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDependencyPlaceholder() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1090]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:950]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3461]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4111]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::CreateImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4257]
UE4Editor_CoreUObject!FLinkerLoad::ResolveAllImports() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1196]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeBlueprint() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1284]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3461]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4111]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2105]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2015]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:699]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:404]
UE4Editor_CoreUObject!GetPackageLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linker.cpp:657]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1196]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2105]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2015]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:699]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:404]
UE4Editor_CoreUObject!GetPackageLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linker.cpp:657]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1196]
UE4Editor_CoreUObject!LoadPackage() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1437]
UE4Editor_CoreUObject!ResolveName() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:722]
UE4Editor_CoreUObject!StaticLoadObjectInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:809]
UE4Editor_CoreUObject!StaticLoadObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:869]
UE4Editor_UnrealEd!FAssetData::GetAsset() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\assetregistry\public\assetdata.h:223]
UE4Editor_UnrealEd!FAssetDragDropOp::Init() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\draganddrop\assetdragdropop.cpp:149]
UE4Editor_UnrealEd!FAssetDragDropOp::New() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\draganddrop\assetdragdropop.cpp:26]
UE4Editor_ContentBrowser!SAssetView::OnDraggingAssetItem() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\contentbrowser\private\sassetview.cpp:3691]
UE4Editor_ContentBrowser!TMemberFunctionCaller::operator()() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstanceinterface.h:161]
UE4Editor_ContentBrowser!TTupleImpl >::ApplyAfter,FGeometry const & __ptr64,FPointerEvent const &() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\tuple.h:116]
UE4Editor_ContentBrowser!TBaseSPMethodDelegateInstance<0,SAssetView,0,FReply __cdecl(FGeometry const & __ptr64,FPointerEvent const & __ptr64)>::Execute() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegateinstancesimpl.h:318]
UE4Editor_ContentBrowser!TBaseDelegate::Execute() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:522]
UE4Editor_ContentBrowser!STableRow >::OnDragDetected() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\public\widgets\views\stablerow.h:564]
UE4Editor_Slate!::operator()() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5122]
UE4Editor_Slate!FEventRouter::Route >() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:215]
UE4Editor_Slate!FSlateApplication::RoutePointerMoveEvent() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5120]
UE4Editor_Slate!FSlateApplication::ProcessMouseMoveEvent() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5653]
UE4Editor_Slate!FSlateApplication::OnMouseMove() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:5592]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:1693]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:2071]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:814]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsapplication.cpp:678]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:951]
UE4Editor!FEngineLoop::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2811]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll
Merry Christmas, Happy Hanukkah, or just Happy Holidays 
Thanks again!