(...) is already loaded, and possibly referenced by external objects

When I run my Session Front end and do the automation tests just to see what errors and such exist I have a lot of instances of this message:

“(insert file here) is already loaded, and possibly referenced by external objects (unable to perform rename tests… Please run again in an empty map).”

I’m not quite sure what exactly it means. I created a new map and have run the Session Frontend test, but it seems to keep erroring out. I’m trying to troubleshoot some packaging . cooking errors, 700+ to be exact…

Any help would be much appreciated!

Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes. If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, could you please submit a new report for it.