Getting this too on another mod. Was editing the Old School MMA (2007) mod, imported many fighters from another mod, so I presume something could have been corrupted during that, but otherwise I am running in administrator mode and there are no other files in the GDS database directory.
Trying to change the database results in the '3197' error code triggering but trying to start a new game results in a different error code of '3421' (Data conversion error).