I keep getting this error when I try to build the lights in my scene;
Access violation - code c0000005 (first/second chance not available)
UE4Editor_UnrealEd!TSet,TDefaultMapKeyFuncs,FDefaultSetAllocator>::Emplace >() [d:\build++ue4+release-4.13+compile\sync\engine\source\runtime\core\public\containers\set.h:484]
UE4Editor_UnrealEd!UEditorEngine::Map_Check() [d:\build++ue4+release-4.13+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:3816]
UE4Editor_UnrealEd!UEditorEngine::HandleMapCommand() [d:\build++ue4+release-4.13+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:5991]
UE4Editor_UnrealEd!UEditorEngine::Exec() [d:\build++ue4+release-4.13+compile\sync\engine\source\editor\unrealed\private\editorserver.cpp:5479]
UE4Editor_UnrealEd!UUnrealEdEngine::Exec() [d:\build++ue4+release-4.13+compile\sync\engine\source\editor\unrealed\private\unrealedsrv.cpp:624]
UE4Editor_Engine!UEngine::TickDeferredCommands() [d:\build++ue4+release-4.13+compile\sync\engine\source\runtime\engine\private\unrealengine.cpp:1111]
UE4Editor!FEngineLoop::Tick() [d:\build++ue4+release-4.13+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2940]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.13+compile\sync\engine\source\runtime\launch\private\launch.cpp:156]
UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.13+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build++ue4+release-4.13+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32
ntdll
Any help would be gratefully received.
-J-