Whats the reason for "Renaming an object on top of an existing object" exception?

Development Platform & Builds
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3

Hi Eric,

do you mean this?

!Id:f6e364f1e0aa816ad8cb0395e960e16a

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

Renaming an object (trailTrigger_C
//Game//Maps//l1.l1:PersistentLevel.trailTrigger_C_14)
on top of an existing object
(REINST_trailTrigger_C_309
//Game//Maps//l1.l1:PersistentLevel.trailTrigger_C_12)
is not allowed

KERNELBASE + 23544 bytes
UE4Editor_Core + 3009491 bytes
UE4Editor_Core + 1775834 bytes
UE4Editor_CoreUObject + 1130858 bytes
UE4Editor_Engine + 1651485 bytes
UE4Editor_Engine + 2394666 bytes
UE4Editor_Engine + 2395585 bytes
UE4Editor_Engine + 1489061 bytes
UE4Editor_UnrealEd + 8903434 bytes
UE4Editor_UnrealEd + 8879001 bytes
UE4Editor_UnrealEd + 8733772 bytes
UE4Editor_UnrealEd + 3626073 bytes
UE4Editor_UnrealEd + 3694825 bytes
UE4Editor_UnrealEd + 1517752 bytes
UE4Editor_UnrealEd + 5564758 bytes
UE4Editor!FEngineLoop::Tick() + 3410
bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.3\engine\source\runtime\launch\private\launchengineloop.cpp:2084]
UE4Editor!GuardedMain() + 476 bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.3\engine\source\runtime\launch\private\launch.cpp:133]
UE4Editor!GuardedMainWrapper() + 26
bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.3\engine\source\runtime\launch\private\windows\launchwindows.cpp:125]
UE4Editor!WinMain() + 249 bytes
[d:\buildfarm\buildmachine_++depot+ue4-releases+4.3\engine\source\runtime\launch\private\windows\launchwindows.cpp:207]
UE4Editor!__tmainCRTStartup() + 329
bytes
[f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c:618]

Thanks