Mel <manchesterismyhea...@gmail.com>

Hi everyone,

I've been working on a map and when I tried to open it, it wouldn't
open and I was given an error message "Python Exception: Precondition
failed". I re-did the map as best I could from memory, and this time I
got "Precondition Exception: Precondition failed".

Has anyone else had this problem? Many thanks in advance.