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

: If the randomizer is in a protected system folder (like "Program Files"), it may lack write permissions. Move the entire randomizer folder and your ROMs to a more accessible location, such as your Desktop or Documents folder.

If you downloaded a ROM pack or moved files from an external drive, the files might be marked as "Read-Only." : If the randomizer is in a protected

Try saving to a simple path like C:\Saves . In software development, an "exception" is an unexpected

In software development, an "exception" is an unexpected event that disrupts the normal flow of a program. An means the emulator encountered a problem it didn’t know how to recover from—so it stopped what it was doing and showed you an error. If your C: drive (or the drive where

Modern games and save states can be large (anywhere from 1MB to 128MB per save). If your C: drive (or the drive where your ROMs live) has less than 200MB of free space, the emulator may fail mid-write.

"there was an unhandled exception trying to save your ROM to disk" typically occurs when using the Universal Pokemon Randomizer

Windows Defender’s Controlled Folder Access (introduced in Windows 10) can block emulators from writing to your Documents, Pictures, or Downloads folders.