Fatal Error 37 can occur when you have players with duplicate first initial last names (for example Reggie and Ron Jackson) on a roster. This situation can mess up the team stats database and cause an error. If you have a roster situation like this, you should edit the last name of one of the players by adding an * to the end of the name.
This error can also occur due to corrupted league files. Double check your rosters and see if there are any duplicate players. If not, you likely have a data corruption.
In either case, there is usually no way to repair the data. You should restore a league backup file or restart your league to correct the issue.