Trying to open Matinee Editor causes Editor to crash

Development Programming & Scripting
1

**I have several other matinees that I can open and edit without a problem but after I tried to create an event in the matinee, the editor will not let me access it. **

Here is the Crash Report:

MachineId:562B7ABA47FC524DE82D21B0A513E04A
EpicAccountId:d0cf1a6bd2f14e0c9f18483aef8762b3

Unknown exception - code 00000001 (first/second chance not available)

"Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.8\Engine\Source\Runtime\Core\Public\Containers\Array.h] [Line: 678]
Arra

UE4Editor_Core!FDebug::AssertFailed() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\misc\outputdevice.cpp:355]
UE4Editor_Engine!AMatineeActor::UpdateInterpForParentMovementTracks() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\interpolation.cpp:933]
UE4Editor_Engine!AMatineeActor::SetupCameraCuts() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\interpolation.cpp:972]
UE4Editor_Engine!AMatineeActor::InitInterp() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\engine\private\interpolation.cpp:879]
UE4Editor_Matinee!FMatinee::InitMatinee() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\matinee\private\matinee.cpp:520]
UE4Editor_Matinee!FMatineeModule::CreateMatinee() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\matinee\private\matineemodule.cpp:48]
UE4Editor_UnrealEd!FEdModeInterpEdit::InitInterpMode() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\editormodeinterpolation.cpp:136]
UE4Editor_UnrealEd!UEditorEngine::OpenMatinee() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\unrealed\private\editorengine.cpp:3355]
UE4Editor_LevelEditor!TBaseStaticDelegateInstance::ExecuteIfSafe() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:921]
UE4Editor_SceneOutliner!UE4Function_Private::TFunctionRefCaller< const ,void cdecl(SceneOutliner::FActorTreeItem const & ptr64)>::Call() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\templates\function.h:193]
UE4Editor_SceneOutliner!SceneOutliner::OnSceneOutlinerItemClicked() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\editor\sceneoutliner\private\sceneoutlinermodule.cpp:25]
UE4Editor_SceneOutliner!TBaseStaticDelegateInstance cdecl(TSharedRef),TBaseDelegate >::Execute() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:853]
UE4Editor_SceneOutliner!TBaseStaticDelegateInstance),TBaseDelegate >::ExecuteIfSafe() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:919]
UE4Editor_SceneOutliner!TBaseDelegate >::ExecuteIfBound() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:519]
UE4Editor_SceneOutliner!SceneOutliner::SSceneOutliner::OnOutlinerTreeSelectionChanged() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\editor\sceneoutliner\private\ssceneoutliner.cpp:1560]
UE4Editor_SceneOutliner!TBaseSPMethodDelegateInstance<0,SceneOutliner::SSceneOutliner,0,TTypeWrapper cdecl(TSharedPtr,enum ESelectInfo::Type)>::Execute() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:282]
UE4Editor_SceneOutliner!TBaseSPMethodDelegateInstance<0,SceneOutliner::SSceneOutliner,0,void cdecl(TSharedPtr,enum ESelectInfo::Type)>::ExecuteIfSafe() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegateinstancesimpl_variadics.inl:388]
UE4Editor_SceneOutliner!TBaseDelegate,enum ESelectInfo::Type>::ExecuteIfBound() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\core\public\delegates\delegatesignatureimpl_variadics.inl:519]
UE4Editor_SceneOutliner!SListView >::Private_SignalSelectionChanged() [d:\buildfarm\buildmachine++depot+ue4-releases+4.8\engine\source\runtime\slate\public\widgets\views\slistview.h:609]
UE4Editor_SceneOutliner!STableRow >::OnMouseButtonUp() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\slate\public\widgets\views\stablerow.h:437]
UE4Editor_SceneOutliner!SceneOutliner::SSceneOutlinerTreeRow::OnMouseButtonUp() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\editor\sceneoutliner\private\soutlinertreeview.cpp:211]
UE4Editor_Slate!::operator()() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4170]
UE4Editor_Slate!FEventRouter::Route >() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:212]
UE4Editor_Slate!FSlateApplication::ProcessMouseButtonUpEvent() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4173]
UE4Editor_Slate!FSlateApplication::OnMouseUp() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\slate\private\framework\application\slateapplication.cpp:4133]
UE4Editor_Core!FWindowsApplication::ProcessDeferredMessage() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsapplication.cpp:1403]
UE4Editor_Core!FWindowsApplication::DeferMessage() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsapplication.cpp:1708]
UE4Editor_Core!FWindowsApplication::ProcessMessage() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsapplication.cpp:706]
UE4Editor_Core!FWindowsApplication::AppWndProc() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsapplication.cpp:628]
user32
user32
UE4Editor_Core!FWindowsPlatformMisc::PumpMessages() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\core\private\windows\windowsplatformmisc.cpp:792]
UE4Editor!FEngineLoop::Tick() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launchengineloop.cpp:2323]
UE4Editor!GuardedMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\launch.cpp:142]
UE4Editor!GuardedMainWrapper() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\buildfarm\buildmachine_++depot+ue4-releases+4.8\engine\source\runtime\launch\private\windows\launchwindows.cpp:200]

2

I’m also having a similar issue with matinee in 4.9. I have three matinees in my project, with 1 of them being quite large. When I try and update the engine version of the project from 4.7 to 4.9, attempting to edit or play that matinee causes the engine to crash.

3

Are you referencing the same actor in multiple Matinee’s by any chance?

4

Not at all. Thankfully I’ve just managed to fix the issue.

The root of the problem was caused by a track we had imported from 3ds Max. Once I’d removed the track from the scene and then removed it from the matinee sequence, I manually activated the track in the level blueprint instead. This allowed me to open matinee and build in 4.9.1. Totally fixed.