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

: Using a ROM that has already been modified (e.g., a "ROM hack" like Pokemon Glazed) often triggers this error because the randomizer expects a clean, unmodified base. Insufficient Permissions

When the message adds it tells us exactly where the crash occurred: the Input/Output (I/O) phase. The emulator successfully ran the game in your RAM (Random Access Memory), but when it attempted to write that data onto your hard drive or SSD, the operating system or the hardware said "No." : Using a ROM that has already been modified (e

: Move the randomizer folder and your ROMs to an open directory like Desktop or Documents , or try running the randomizer as an Administrator . : Using a ROM that has already been modified (e