While deleting the folder this message is displayed or while renaming?
I can reproduce that when I rename a folder without an dir.c9r-file (like your .tmp folders), that it creates a new folder with the target name and shows An error occurred because it couldn’t move the dir-file. But I’m able to delete both folders without any problem.
Can you please enable debug mode, try to delete those folders again and send us the log file? How do I enable debug mode on Android?