just like the question sayd , unreal is chrashong and i dont know why
Generating report for minidump
Application version 4.10.1
… built from changelist 2791327
OS version 10.0.0.10240
Running 8 x64 processors
Exception was “Access violation - code c0000005 (first/second chance not available)”
_UnrealEd!ApplyUnroll() []
UE4Editor_UnrealEd!ApplyUnroll() []
UE4Editor_UnrealEd!ApplyUnroll() []
UE4Editor_UnrealEd!ApplyUnroll() []
UE4Editor_UnrealEd!ApplyUnroll() []
UE4Editor_UnrealEd!UnFbx::FFbxImporter::MergeAllLayerAnimation() []
UE4Editor_UnrealEd!UnFbx::FFbxImporter::ValidateAnimStack() []
UE4Editor_UnrealEd!UnFbx::FFbxImporter::ImportAnimations() []
UE4Editor_UnrealEd!UnFbx::FFbxImporter::SetupAnimationDataFromMesh() []
UE4Editor_UnrealEd!UFbxFactory::FactoryCreateBinary() []
UE4Editor_UnrealEd!UFactory::StaticImportObject() []
UE4Editor_UnrealEd!AttemptImport() []
UE4Editor_UnrealEd!FContentDirectoryMonitor::ProcessAdditions() [
UE4Editor_UnrealEd!FAutoReimportManager::ProcessAdditions() []
UE4Editor_UnrealEd!::operator()() []
UE4Editor_UnrealEd!UE4Function_Private::TFunctionRefCaller<,TOptional __cdecl(DirectoryWatcher::FTimeLimit const & __ptr64)>::Call() ]
UE4Editor_UnrealEd!UE4Function_Private::TFunctionRefBase __cdecl(DirectoryWatcher::FTimeLimit const & __ptr64)>::operator()() []
UE4Editor_UnrealEd!FStateMachine::Tick() []
UE4Editor_UnrealEd!FAutoReimportManager::Tick() ]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() []
UE4Editor_UnrealEd!UEditorEngine::Tick() []
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() []
UE4Editor!FEngineLoop::Tick() []
UE4Editor!GuardedMain() []
UE4Editor!GuardedMainWrapper() []
UE4Editor!WinMain() []
UE4Editor!__scrt_common_main_seh() []
kernel32
ntdll