Map will not load after moving a child actor in a blueprint

Development Programming & Scripting Blueprint
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1

I have created a composite actor using blueprint that contains a child actor. I moved the child actor into a scene component in my components view in the graph and now I cannot load the scene file where the blueprint is instanced. This scene file represents around 20 hours of work so reverting to an earlier version isn’t an option. If I attempt to open this map file the application crashes.

!Id:d6c993271e43016d33b3d4666d452c6d

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

Renaming an object (CoverPoint_Actor_C //Game//Maps//map-003.map-003:PersistentLevel.CoverPoint_Actor_C_607) on top of an existing object (FreightElevator_Switch_BP_C //Game//Maps//map-003.map-003:PersistentLevel.CoverPoint_Actor_C_4) is not allowed

KERNELBASE + 37901 bytes
UE4Editor_Core + 3095292 bytes
UE4Editor_Core + 1661738 bytes
UE4Editor_CoreUObject + 1105514 bytes
UE4Editor_Engine + 1797805 bytes
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UE4Editor_LevelEditor + 1562728 bytes
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UE4Editor!FEngineLoop::Tick() + 2877 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launchengineloop.cpp:2080]
UE4Editor!GuardedMain() + 476 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\launch.cpp:133]
UE4Editor!GuardedMainWrapper() + 26 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
UE4Editor!WinMain() + 249 bytes [d:\buildfarm\buildmachine_++depot+ue4-releases+4.4\engine\source\runtime\launch\private\windows\launchwindows.cpp:201]
UE4Editor!__tmainCRTStartup() + 329 bytes [f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

2

I was able to restore access to the scene but this is still a bug, my workflow was as follows:

  1. Rename the trouble asset in your file system (I just added a - to the end of the filename)
  2. Open the project and then open the level that was previously crashing. UE will delete the instance of the asset that is now linked to an invalid blueprint and show you a warning in the log.
  3. Save the scene file and quit UE.
  4. Restore the original blueprint filename and then reopen your project.
  5. Re-instantiate the troubled asset in your scene.
3

Hi Thomas,

I haven’t been able to get your results when trying to reproduce this. Could you also post some screenshots showing your setup and repro steps?

4

Hi Thomas,

We haven’t heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you’re still experiencing this issue, please feel free to post back here with additional information.

Thanks, TJ