There Was An Unhandled Exception Trying To Save Your Rom To Disk [best] Here

: If you have used a tool to reduce the file size of your ROM (trimming), the randomizer may fail to save. Use a completely unmodified, clean ROM instead.

Sometimes, the "unhandled exception" is a symptom that your save file or ROM is irrevocably corrupted. If a specific ROM always triggers the error upon saving, while all other ROMs work, the issue lies within that file. In such cases, you must source a clean copy of the ROM or abandon the corrupted save file. : If you have used a tool to