This is a common crash affecting users in 4.16, unfortunately they have not provided any additional information.
Source Context
406 if ( IndexPtr == NULL ) 407 { 408 LinkupIndex = BuildLinkup(InSkelMesh); 409 } 410 else 411 { 412 LinkupIndex = *IndexPtr; 413 } 414 415 // make sure it's not out of range 416 check (LinkupIndex < LinkupCache.Num()); 417 418 return LinkupIndex; 419 ***** }
repro steps currently unknown
Assertion failed: LinkupIndex < LinkupCache.Num() [File:D:\Build\++UE4+Release-4.16+Compile\Sync\Engine\Source\Runtime\Engine\Private\Animation\Skeleton.cpp] [Line: 417] UE4Editor_Engine!USkeleton::GetMeshLinkupIndex() [skeleton.cpp:420] UE4Editor_Engine!FBoneContainer::RemapFromSkelMesh() [bonecontainer.cpp:293] UE4Editor_Engine!FBoneContainer::Initialize() [bonecontainer.cpp:106] UE4Editor_Engine!FAnimInstanceProxy::RecalcRequiredBones() [animinstanceproxy.cpp:826] UE4Editor_Engine!UAnimInstance::RecalcRequiredBones() [animinstance.cpp:962] UE4Editor_Engine!USkeletalMeshComponent::RecalcRequiredBones() [skeletalmeshcomponent.cpp:1437] UE4Editor_Engine!USkeletalMeshComponent::InitAnim() [skeletalmeshcomponent.cpp:577] UE4Editor_UnrealEd!UDebugSkelMeshComponent::InitAnim() [debugskelmeshcomponent.cpp:253] UE4Editor_Engine!USkeletalMeshComponent::OnRegister() [skeletalmeshcomponent.cpp:451] UE4Editor_Engine!UActorComponent::ExecuteRegisterEvents() [actorcomponent.cpp:1223] UE4Editor_Engine!FComponentReregisterContextBase::ReRegister() [componentreregistercontext.h:68] UE4Editor_Engine!UActorComponent::ConsolidatedPostEditChange() [actorcomponent.cpp:638] UE4Editor_Engine!USceneComponent::PostEditChangeProperty() [scenecomponent.cpp:439] UE4Editor_Engine!UPrimitiveComponent::PostEditChangeProperty() [primitivecomponent.cpp:797] UE4Editor_Engine!USkinnedMeshComponent::PostEditChangeProperty() [skinnedmeshcomponent.cpp:550] UE4Editor_Engine!USkeletalMeshComponent::PostEditChangeProperty() [skeletalmeshcomponent.cpp:737] UE4Editor_CoreUObject!UObject::PostEditUndo() [obj.cpp:529] UE4Editor_UnrealEd!FTransaction::Apply() [editortransaction.cpp:499] UE4Editor_UnrealEd!UTransBuffer::Undo() [editortransaction.cpp:864] UE4Editor_UnrealEd!UEditorEngine::Exec_Transaction() [editorserver.cpp:5198] UE4Editor_UnrealEd!UEditorEngine::Exec() [editorserver.cpp:5645] UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [unrealedsrv.cpp:670] UE4Editor_MainFrame!FMainFrameActionCallbacks::ExecuteExecCommand() [mainframeactions.cpp:969] UE4Editor_MainFrame!TBaseStaticDelegateInstance<void __cdecl() [delegateinstancesimpl.h:1027] UE4Editor_Slate!FUICommandList::ConditionalProcessCommandBindings() [uicommandlist.cpp:216] UE4Editor_Slate!FUICommandList::ProcessCommandBindings() [uicommandlist.cpp:160] UE4Editor_MainFrame!FMainFrameActionCallbacks::OnUnhandledKeyDownEvent() [mainframeactions.cpp:211] UE4Editor_MainFrame!UE4Tuple_Private::TTupleImpl<TIntegerSequence<unsigned int> >::ApplyAfter<FReply() [tuple.h:497] UE4Editor_MainFrame!TBaseStaticDelegateInstance<FReply __cdecl() [delegateinstancesimpl.h:958] UE4Editor_Slate!TBaseDelegate<FReply,FKeyEvent const & __ptr64>::Execute() [delegatesignatureimpl.inl:537] UE4Editor_Slate!FSlateApplication::ProcessKeyDownEvent() [slateapplication.cpp:4641] UE4Editor_Slate!FSlateApplication::OnKeyDown() [slateapplication.cpp:4541] UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [windowsapplication.cpp:1539] UE4Editor_Core!FWindowsApplication::DeferMessage() [windowsapplication.cpp:2127] UE4Editor_Core!FWindowsApplication::ProcessMessage() [windowsapplication.cpp:867] UE4Editor_Core!FWindowsApplication::AppWndProc() [windowsapplication.cpp:714] user32!UserCallWinProcCheckWow() user32!DispatchMessageWorker() UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [windowsplatformmisc.cpp:1009] UE4Editor!FEngineLoop::Tick() [launchengineloop.cpp:3058] UE4Editor!GuardedMain() [launch.cpp:166] UE4Editor!GuardedMainWrapper() [launchwindows.cpp:134] UE4Editor!WinMain() [launchwindows.cpp:210] UE4Editor!__scrt_common_main_seh() [exe_common.inl:253] kernel32!BaseThreadInitThunk() ntdll!RtlUserThreadStart()
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-47476 in the post.