generate_tiles.py under python and it generates tiles but then stops

Hi,

I am running generate_tiles.py under python ( by starting Python 2.5 → IDLE (Python GUI) opening the generate_tiles.py file and then selecting Run → Run Module ) and it generates tiles but after a minute it stops before completing all the zoom levels.

I then try rerunning and then it runs a little further but then it also stops before completing all zoom levels.

John