A user reported an issue resulting in a crash with callstack pasted below.
After a brief investigation I've found that user was able to successfully compile a blueprint where a function taking an AActor parameter, that defaults to "self" (meta=(DefaultToSelf="Target")) is being used where "self" is an UObject.
This should not compile, and the resulting callstack does not indicate what was the problem.
> UE4Editor-CoreUObject-Win64-Debug.dll!UObject::CallFunction(FFrame & Stack, void * const Result, UFunction * Function) Line 376 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::execFinalFunction(FFrame & Stack, void * const Result) Line 1537 C++ UE4Editor-CoreUObject-Win64-Debug.dll!FFrame::Step(UObject * Context, void * const Result) Line 126 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::ProcessContextOpcode(FFrame & Stack, void * const Result, bool bCanFailSilently) Line 1451 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::execContext_FailSilent(FFrame & Stack, void * const Result) Line 1434 C++ UE4Editor-CoreUObject-Win64-Debug.dll!FFrame::Step(UObject * Context, void * const Result) Line 126 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::ProcessInternal(FFrame & Stack, void * const Result) Line 625 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::CallFunction(FFrame & Stack, void * const Result, UFunction * Function) Line 516 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::execVirtualFunction(FFrame & Stack, void * const Result) Line 1530 C++ UE4Editor-CoreUObject-Win64-Debug.dll!FFrame::Step(UObject * Context, void * const Result) Line 126 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::ProcessInternal(FFrame & Stack, void * const Result) Line 625 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UFunction::Invoke(UObject * Obj, FFrame & Stack, void * const Result) Line 3684 C++ UE4Editor-CoreUObject-Win64-Debug.dll!UObject::ProcessEvent(UFunction * Function, void * Parms) Line 927 C++ UE4Editor-AIModule-Win64-Debug.dll!UBTService_BlueprintBase::ReceiveTickAI(AAIController * OwnerController, APawn * ControlledPawn, float DeltaSeconds) Line 1018 C++ UE4Editor-AIModule-Win64-Debug.dll!UBTService_BlueprintBase::TickNode(UBehaviorTreeComponent & OwnerComp, unsigned char * NodeMemory, float DeltaSeconds) Line 117 C++ UE4Editor-AIModule-Win64-Debug.dll!UBTService::OnSearchStart(FBehaviorTreeSearchData & SearchData) Line 26 C++ UE4Editor-AIModule-Win64-Debug.dll!UBTService_BlueprintBase::OnSearchStart(FBehaviorTreeSearchData & SearchData) Line 109 C++ UE4Editor-AIModule-Win64-Debug.dll!UBTService::NotifyParentActivation(FBehaviorTreeSearchData & SearchData) Line 38 C++ UE4Editor-AIModule-Win64-Debug.dll!UBTCompositeNode::OnNodeActivation(FBehaviorTreeSearchData & SearchData) Line 136 C++ UE4Editor-AIModule-Win64-Debug.dll!UBehaviorTreeComponent::ProcessExecutionRequest() Line 907 C++ UE4Editor-AIModule-Win64-Debug.dll!UBehaviorTreeComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction * ThisTickFunction) Line 820 C++ UE4Editor-Engine-Win64-Debug.dll!UActorComponent::ConditionalTickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction & ThisTickFunction) Line 1045 C++ UE4Editor-Engine-Win64-Debug.dll!FActorComponentTickFunction::ExecuteTick(float DeltaTime, ELevelTick TickType, ENamedThreads::Type CurrentThread, const TRefCountPtr<FGraphEvent> & MyCompletionGraphEvent) Line 602 C++ UE4Editor-Engine-Win64-Debug.dll!FTickTaskSequencer::FTickFunctionTask::DoTask(ENamedThreads::Type CurrentThread, const TRefCountPtr<FGraphEvent> & MyCompletionGraphEvent) Line 322 C++ UE4Editor-Engine-Win64-Debug.dll!TGraphTask<FTickTaskSequencer::FTickFunctionTask>::ExecuteTask(TArray<FBaseGraphTask *,FDefaultAllocator> & NewTasks, ENamedThreads::Type CurrentThread) Line 669 C++ UE4Editor-Core-Win64-Debug.dll!FBaseGraphTask::Execute(TArray<FBaseGraphTask *,FDefaultAllocator> & NewTasks, ENamedThreads::Type CurrentThread) Line 301 C++ UE4Editor-Core-Win64-Debug.dll!FTaskThread::ProcessTasks(int QueueIndex, bool bAllowStall) Line 428 C++ UE4Editor-Core-Win64-Debug.dll!FTaskThread::ProcessTasksUntilQuit(int QueueIndex) Line 271 C++ UE4Editor-Core-Win64-Debug.dll!FTaskGraphImplementation::ProcessThreadUntilRequestReturn(ENamedThreads::Type CurrentThread) Line 940 C++ UE4Editor-Core-Win64-Debug.dll!FTaskGraphImplementation::WaitUntilTasksComplete(const TArray<TRefCountPtr<FGraphEvent>,TInlineAllocator<4,FDefaultAllocator> > & Tasks, ENamedThreads::Type CurrentThreadIfKnown) Line 984 C++ UE4Editor-Engine-Win64-Debug.dll!FTaskGraphInterface::WaitUntilTaskCompletes(const TRefCountPtr<FGraphEvent> & Task, ENamedThreads::Type CurrentThreadIfKnown) Line 188 C++ UE4Editor-Engine-Win64-Debug.dll!FTickTaskSequencer::ReleaseTickGroup(ETickingGroup WorldTickGroup, bool bBlockTillComplete) Line 187 C++ UE4Editor-Engine-Win64-Debug.dll!FTickTaskManager::RunTickGroup(ETickingGroup Group, bool bBlockTillComplete) Line 722 C++ UE4Editor-Engine-Win64-Debug.dll!UWorld::RunTickGroup(ETickingGroup Group, bool bBlockTillComplete) Line 696 C++ UE4Editor-Engine-Win64-Debug.dll!UWorld::Tick(ELevelTick TickType, float DeltaSeconds) Line 1119 C++ UE4Editor-UnrealEd-Win64-Debug.dll!UEditorEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 1329 C++ UE4Editor-UnrealEd-Win64-Debug.dll!UUnrealEdEngine::Tick(float DeltaSeconds, bool bIdleMode) Line 347 C++ UE4Editor-Win64-Debug.exe!FEngineLoop::Tick() Line 2257 C++ UE4Editor-Win64-Debug.exe!EngineTick() Line 52 C++ UE4Editor-Win64-Debug.exe!GuardedMain(const wchar_t * CmdLine, HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, int nCmdShow) Line 145 C++ UE4Editor-Win64-Debug.exe!WinMain(HINSTANCE__ * hInInstance, HINSTANCE__ * hPrevInstance, char * __formal, int nCmdShow) Line 191 C++
1. Create a blueprint class derived from Object
2. In its event graph add a call to GetBlackboard
3. Add a custom event and use the results of previous call, just to make sure it gets compiled
4. Compile the blueprint
Result: it should not compile!
I am not able to find world outliner how to enable it?
Undefined sysmbol: typeinfo for AActor when cross-compile linux dedicated server on windows
Delay nodes occasionally don't fire the "Completed" output in a nativized build
An error occurred while trying to generate project files !?
How does UMG set overlapping layouts?
What method is used to fill polygonal regions when drawing spline mesh at run time?
Installer 4.10 failed with error code R-1603
When I open UE4 4.24.3 it appears that. Does anyone know how to solve?
Head over to the existing Questions & Answers thread and let us know what's up.
| 0 |
| Component | UE - Gameplay - Blueprint |
|---|---|
| Affects Versions | 4.7.1, 4.7.2 |
| Target Fix | 4.8 |
| Fix Commit | 2471338 |
|---|
| Created | Mar 5, 2015 |
|---|---|
| Resolved | Mar 6, 2015 |
| Updated | Apr 27, 2018 |