Crash after add a variable inside a Structure

Every time I try to add a variable to a specific structure, crashes. I’m trying everything to fix that, I even already deleted the file and created another similar to it. I don’t want to create the project again if possible. Can someone help me?

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Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xffffffffffffffff

UE4Editor_CoreUObject!UObjectBase::GetExternalPackage() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectBase.cpp:223]
UE4Editor_CoreUObject!UObjectBaseUtility::GetOutermost() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\UObjectBaseUtility.cpp:198]
UE4Editor_UnrealEd!FArchiveInvalidateTransientRefs::operator<<() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:122]
UE4Editor_Core!FStructuredArchiveSlot::operator<<() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Private\Serialization\StructuredArchive.cpp:508]
UE4Editor_CoreUObject!FObjectProperty::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyObject.cpp:98]
UE4Editor_CoreUObject!UStruct::SerializeBin() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1092]
UE4Editor_CoreUObject!UScriptStruct::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:2770]
UE4Editor_CoreUObject!FStructProperty::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyStruct.cpp:152]
UE4Editor_CoreUObject!UStruct::SerializeBin() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1092]
UE4Editor_CoreUObject!UScriptStruct::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:2770]
UE4Editor_CoreUObject!FStructProperty::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyStruct.cpp:152]
UE4Editor_CoreUObject!UStruct::SerializeBin() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1092]
UE4Editor_CoreUObject!UScriptStruct::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:2770]
UE4Editor_CoreUObject!FStructProperty::SerializeItem() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyStruct.cpp:152]
UE4Editor_CoreUObject!UStruct::SerializeBin() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1092]
UE4Editor_CoreUObject!UObject::SerializeScriptProperties() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp:1471]
UE4Editor_CoreUObject!UObject::Serialize() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp:1377]
UE4Editor_CoreUObject!UObject::Serialize() [D:\Build++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Obj.cpp:1262]
UE4Editor_Engine!AActor::Serialize() [D:\Build++UE4\Sync\Engine\Source\Runtime\Engine\Private\Actor.cpp:716]
UE4Editor_UnrealEd!FKismetEditorUtilities::StripExternalComponents() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\Kismet2.cpp:2562]
UE4Editor_Kismet!FBlueprintCompilationManagerImpl::FlushCompilationQueueImpl() [D:\Build++UE4\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:1425]
UE4Editor_Kismet!FBlueprintCompilationManagerImpl::CompileSynchronouslyImpl() [D:\Build++UE4\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:277]
UE4Editor_Kismet!FBlueprintCompilationManager::CompileSynchronously() [D:\Build++UE4\Sync\Engine\Source\Editor\Kismet\Private\BlueprintCompilationManager.cpp:3090]
UE4Editor_UnrealEd!FBlueprintEditorUtils::MarkBlueprintAsStructurallyModified() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\BlueprintEditorUtils.cpp:2074]
UE4Editor_KismetCompiler!FUserDefinedStructureCompilerUtils::CompileStruct() [D:\Build++UE4\Sync\Engine\Source\Editor\KismetCompiler\Private\UserDefinedStructureCompilerUtils.cpp:534]
UE4Editor_KismetCompiler!FKismet2CompilerModule::CompileStructure() [D:\Build++UE4\Sync\Engine\Source\Editor\KismetCompiler\Private\KismetCompilerModule.cpp:86]
UE4Editor_UnrealEd!FStructureEditorUtils::CompileStructure() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\StructureEditorUtils.cpp:544]
UE4Editor_UnrealEd!FStructureEditorUtils::AddVariable() [D:\Build++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\Kismet2\StructureEditorUtils.cpp:317]
UE4Editor_Kismet!FUserDefinedStructureLayout::OnAddNewField() [D:\Build++UE4\Sync\Engine\Source\Editor\Kismet\Private\UserDefinedStructureEditor.cpp:465]
UE4Editor_Kismet!TBaseSPMethodDelegateInstance<0,FUserDefinedStructureLayout,0,FReply __cdecl(void),FDefaultDelegateUserPolicy>::Execute() [D:\Build++UE4\Sync\Engine\Source\Runtime\Core\Public\Delegates\DelegateInstancesImpl.h:290]
UE4Editor_Slate!SButton::ExecuteOnClick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:385]
UE4Editor_Slate!SButton::OnMouseButtonUp() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Widgets\Input\SButton.cpp:304]
UE4Editor_Slate!FEventRouter::Route >() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:378]
UE4Editor_Slate!FSlateApplication::RoutePointerUpEvent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:4815]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5356]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [D:\Build++UE4\Sync\Engine\Source\Runtime\Slate\Private\Framework\Application\SlateApplication.cpp:5321]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessDeferredMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2178]
UE4Editor_ApplicationCore!FWindowsApplication::DeferMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:2642]
UE4Editor_ApplicationCore!FWindowsApplication::ProcessMessage() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:1046]
UE4Editor_ApplicationCore!FWindowsApplication::AppWndProc() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsApplication.cpp:878]
user32
user32
UE4Editor_ApplicationCore!FWindowsPlatformApplicationMisc::PumpMessages() [D:\Build++UE4\Sync\Engine\Source\Runtime\ApplicationCore\Private\Windows\WindowsPlatformApplicationMisc.cpp:130]
UE4Editor!FEngineLoop::Tick() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4748]
UE4Editor!GuardedMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:169]
UE4Editor!GuardedMainWrapper() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!WinMain() [D:\Build++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:268]
UE4Editor!__scrt_common_main_seh() [d:\agent_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll