An error occurred while opening your game

Hi there,

I'm pretty new to Twine and have been making a fairly simple game just for fun mostly.

When I went to work on it today though the program refused to open and showed this error message.

An error occurred while opening your game.

Traceback (Most recent call last);

File "app.py", line 103, in open
File "pickle.pyo", line 1378, in load
File "pickle.pyo", line 858, in load

KeyError: '\x00'

What exactly does that mean? More importantly is there anyway of recovering my file? Finally is there anyway to avoid this in the future (other than archive saving)?

Any help or advice would be appreciated!