I googled your problem and found this, baring in mind this was for fm2010 so i'm not sure if it would work so i apologise in advance if it doesn't.
''Yep, if it's an xml parsing error do this:
If you have a shortcut on your desktop you can do the following:
1. Right-click on the FM shortcut.
2. Properties
3. In the "Target" field, add the --reset_preferences command line option after "fm.exe", so it should look like this:
"C:\Program Files\Sports Interactive\Football Manager 2010\fm.exe" --reset_preferences
4. OK.
After the game is working remove the extra command from the shortcut.
If you don't have a shortcut to the game create one. ''