There Was An Unhandled Exception Trying To Save Your Rom To Disk

: Specific bugs in older versions (e.g., handling German versions of Black/White ) have been fixed in newer releases like UPR ZX v4.3.0 or later . Ensure you are using the latest version from GitHub . How to Find More Detail [Bug] Issue by 'Randomize (Save)' #771 - GitHub

This error message is specific to the Universal Pokemon Randomizer (UPR) or its updated version,

Possible causes

Alternatively, rename your folders to be shorter (e.g., C:\SNES\SMB ).

Save States are prone to errors. Use the in-game save menu frequently.