Your config file is giving out an error for some reason. It could be for a lot of different reasons, from a hardware malfunction when saving, an antivirus, a windows crash, an older version's savefile trying to be loaded, a file being sent from one computer into a different one, or something else.
But either way, it's just the config file, so you can go to C:\Users\ [your user] \AppData\Local\PocketCrystalLeague and delete the config.sav file.