Comment 7 for bug 1506864

Additional note again , still related to this case :

If above case happened, then when I did list the footprint in the library file, not all the existing files displayed ( pict 4).
That's why an above err.message prompted.

Only if the Kicad restarted, then it displayed the complete files on the library, it backs to normal ( pict 5 )

Thanks, and if any other required infos pls let me know.