Problem with the Bull Cow Game, first function

Im getting this error log, after adding the function, it works perfect.
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

UE4Editor_Core!rml::internal::Block::freePublicObject()
UE4Editor_Core!scalable_free()
UE4Editor_Core!FMemory::Free() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\HAL\FMemory.inl:80]
UE4Editor_Core!FString::~FString()
UE4Editor_BullCowGame_0788!UBullCowCartridge::`vector deleting destructor’()
UE4Editor_CoreUObject!FAsyncPurge::TickPurge() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:488]
UE4Editor_CoreUObject!IncrementalDestroyGarbage() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:1783]
UE4Editor_CoreUObject!IncrementalPurgeGarbage() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:1511]
UE4Editor_CoreUObject!CollectGarbageInternal() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:2074]
UE4Editor_CoreUObject!CollectGarbage() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\GarbageCollection.cpp:2170]
UE4Editor_Engine!UGameInstance::InitializeForPlayInEditor() [D:\Build++UE4\Sync\Engine\Source\Runtime\Engine\Private\GameInstance.cpp:317]
UE4Editor_UnrealEd!UEditorEngine::CreateInnerProcessPIEGameInstance() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:2785]
UE4Editor_UnrealEd!UEditorEngine::OnLoginPIEComplete_Deferred() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1503]
UE4Editor_UnrealEd!UEditorEngine::CreateNewPlayInEditorInstance() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1750]
UE4Editor_UnrealEd!UEditorEngine::StartPlayInEditorSession() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:2713]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlaySessionRequestImpl() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1116]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlaySessionRequest() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\PlayLevel.cpp:1019]
UE4Editor_UnrealEd!UEditorEngine::Tick() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1629]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:426]
UE4Editor!FEngineLoop::Tick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4921]
UE4Editor!GuardedMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:178]
UE4Editor!GuardedMainWrapper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!LaunchWindowsStartup() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:273]
UE4Editor!WinMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:320]
UE4Editor!__scrt_common_main_seh() [d:\agent_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

I run the code on visual studio and I get the next message:

Hope someone can help me, I try starting from 0 on the project but it didn’t work. Maybe is something wrong with my workspace?

Close Unreal and then delete your projects Binaries and Intermediate folders then rebuild by launching the project.

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