Unreal Engine Issues and Bug Tracker (UE-13070)

Description

Casting to a character class inside of AnimBlueprint after a hot reload caused editor to crash

Crash Reporter:
[Link Removed]

Additionally, Casts fail, breaking AnimBlueprint after a hot reload

Steps to Reproduce

1. Create new Code based project (third person template)
2. Add code to project based on Character
3. Add the following to the header file of the class:

	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = others)
		USkeletalMesh* skeleMesh;
	
	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = others)
		bool returnThis;

	UFUNCTION(BlueprintCallable, Category = others)
		bool ImLovinIt() const;

4. Add the following to the source file of the class:

	bool AMyCharacter::ImLovinIt() const
{
	return returnThis;
}

5. Compile
6. Create a new blueprint based off of the custom class
7. Add a skeletal mesh to the skeletal mesh component
8. Create a new AnimBlueprint
9. In the event graph pull off from "Try Get Pawn Owner" and create a cast to the custom class
10. In VS, add the following to trigger hot reload

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = others)
		bool returnThis;

11. Compile in VS or the editor
12. In the AnimBlueprint, drag off of "Try Get Pawn Owner" and create a cast to node for custom class

Result:
Editor will crash

Callstack

Assertion failed: (TargetType == NULL) || (!TargetType->HasAnyClassFlags(CLASS_NewerVersionExists)) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.7\Engine\Source\Editor\BlueprintGraph\Private\K2Node_DynamicCast.cpp] [Line: 26] 



KERNELBASE.dll!UnknownFunction (0x000007fefd35940d) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!FOutputDeviceWindowsError::Serialize() (0x000007fede658014) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformoutputdevices.cpp:95]
UE4Editor-Core.dll!FOutputDevice::Logf__VA() (0x000007fede4d7818) + 159 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:144]
UE4Editor-Core.dll!FDebug::AssertFailed() (0x000007fede4b8b17) + 62 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\misc\outputdevice.cpp:224]
UE4Editor-BlueprintGraph.dll!UK2Node_DynamicCast::AllocateDefaultPins() (0x000007fed7db5570) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\blueprintgraph\private\k2node_dynamiccast.cpp:28]
UE4Editor-BlueprintGraph.dll!UBlueprintNodeSpawner::SpawnEdGraphNode() (0x000007fed7d37427) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\blueprintgraph\private\blueprintnodespawner.cpp:283]
UE4Editor-BlueprintGraph.dll!UBlueprintNodeSpawner::SpawnNode<UEdGraphNode>() (0x000007fed7cb3b69) + 63 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\blueprintgraph\public\blueprintnodespawner.h:237]
UE4Editor-BlueprintGraph.dll!UBlueprintNodeSpawner::Invoke() (0x000007fed7d1e3ed) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\blueprintgraph\private\blueprintnodespawner.cpp:229]
UE4Editor-Kismet.dll!FBlueprintActionMenuItem::PerformAction() (0x000007fed66f8460) + 33 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\kismet\private\blueprintactionmenuitem.cpp:153]
UE4Editor-Kismet.dll!FBlueprintActionMenuItem::PerformAction() (0x000007fed66f7cc8) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\kismet\private\blueprintactionmenuitem.cpp:202]
UE4Editor-Kismet.dll!SBlueprintActionMenu::OnActionSelected() (0x000007fed68301ad) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\kismet\private\sblueprintactionmenu.cpp:467]
UE4Editor-Kismet.dll!TBaseSPMethodDelegateInstance<0,SBlueprintActionMenu,0,TTypeWrapper<void> __cdecl(TArray<TSharedPtr<FEdGraphSchemaAction,0>,FDefaultAllocator> const & __ptr64)>::Execute() (0x000007fed67eda4c) + 35 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282]
UE4Editor-GraphEditor.dll!SGraphActionMenu::HandleSelection() (0x000007fed8429da9) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\grapheditor\private\sgraphactionmenu.cpp:1313]
UE4Editor-GraphEditor.dll!SGraphActionMenu::TryToSpawnActiveSuggestion() (0x000007fed84a51e5) + 66 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\editor\grapheditor\private\sgraphactionmenu.cpp:891]
UE4Editor-GraphEditor.dll!TBaseSPMethodDelegateInstance<0,SGraphActionMenu,0,TTypeWrapper<void> __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::Execute() (0x000007fed83ebe17) + 38 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282]
UE4Editor-GraphEditor.dll!TBaseSPMethodDelegateInstance<0,SGraphActionMenu,0,void __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::ExecuteIfSafe() (0x000007fed83efef7) + 14 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:388]
UE4Editor-Slate.dll!SSearchBox::HandleTextCommitted() (0x000007fedb105c18) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\widgets\input\ssearchbox.cpp:153]
UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SSearchBox,0,TTypeWrapper<void> __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::Execute() (0x000007fedb0f4107) + 38 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282]
UE4Editor-Slate.dll!TBaseSPMethodDelegateInstance<0,SSearchBox,0,void __cdecl(FText const & __ptr64,enum ETextCommit::Type)>::ExecuteIfSafe() (0x000007fedb0f57d7) + 14 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:388]
UE4Editor-Slate.dll!SEditableText::OnEnter() (0x000007fedb119969) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\widgets\input\seditabletext.cpp:973]
UE4Editor-Slate.dll!FTextEditHelper::OnKeyDown() (0x000007fedb05c6e8) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\text\textedithelper.cpp:173]
UE4Editor-Slate.dll!SEditableText::OnKeyDown() (0x000007fedb11c21c) + 74 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\widgets\input\seditabletext.cpp:1628]
UE4Editor-Slate.dll!<lambda_01b95f45d99b75c93c453dee9d82570e>::operator()() (0x000007fedaf3c872) + 38 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:3581]
UE4Editor-Slate.dll!FEventRouter::Route<FReply,FEventRouter::FBubblePolicy,FKeyEvent,<lambda_01b95f45d99b75c93c453dee9d82570e> >() (0x000007fedaef6e4d) + 21 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:202]
UE4Editor-Slate.dll!FEventRouter::RouteAlongFocusPath<FEventRouter::FBubblePolicy,<lambda_01b95f45d99b75c93c453dee9d82570e>,FKeyEvent>() (0x000007fedaef894a) + 52 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:184]
UE4Editor-Slate.dll!FSlateApplication::ProcessKeyDownEvent() (0x000007fedafa3e6d) + 93 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:3582]
UE4Editor-Slate.dll!FSlateApplication::OnKeyDown() (0x000007fedaf93798) + 14 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:3517]
UE4Editor-Core.dll!FWindowsApplication::ProcessDeferredMessage() (0x000007fede5b35f0) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsapplication.cpp:1229]
UE4Editor-Core.dll!FWindowsApplication::DeferMessage() (0x000007fede5a5cce) + 74 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsapplication.cpp:1669]
UE4Editor-Core.dll!FWindowsApplication::ProcessMessage() (0x000007fede5b4cf0) + 41 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsapplication.cpp:742]
UE4Editor-Core.dll!FWindowsApplication::AppWndProc() (0x000007fede5a3132) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsapplication.cpp:604]
USER32.dll!UnknownFunction (0x0000000077179bd1) + 0 bytes [UnknownFile:0]
USER32.dll!UnknownFunction (0x00000000771798da) + 0 bytes [UnknownFile:0]
UE4Editor-Core.dll!FWindowsPlatformMisc::PumpMessages() (0x000007fede653e66) + 48 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:774]
UE4Editor.exe!FEngineLoop::Tick() (0x000000013f0400a9) + 8 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launchengineloop.cpp:2233]
UE4Editor.exe!GuardedMain() (0x000000013f03267c) + 0 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor.exe!GuardedMainWrapper() (0x000000013f0326ea) + 5 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor.exe!WinMain() (0x000000013f042219) + 17 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.7\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor.exe!__tmainCRTStartup() (0x000000013f043159) + 21 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]
kernel32.dll!UnknownFunction (0x00000000770559ed) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x000000007728c541) + 0 bytes [UnknownFile:0]
ntdll.dll!UnknownFunction (0x000000007728c541) + 0 bytes [UnknownFile:0]

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Cannot Reproduce

Component	OLD - Anim
Affects Versions	4.7.3
Target Fix	4.8

Fix Commit	2505590

Created	Mar 31, 2015
Resolved	Apr 8, 2015
Updated	May 18, 2020

View Jira Issue

UE-13070

Hot reload causes AnimBlueprint to lose functionality and crash

Hot reload causes AnimBlueprint to lose functionality and crash

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