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

To: Development TeamSubject: Bug Report: Unhandled Exception during ROM Disk Write  🚨 Issue Summary 

An unhandled exception occurred when the system attempted to save the ROM file to the local disk. This error interrupted the save process, potentially leading to data loss or corrupted save states.  💻 Technical Details  Error Type: Unhandled Exception (I/O Error) Action: Save to Disk Target: ROM File (.gb, .gba, .nds, .nes, .sfc, etc.)  🔍 Potential Root Causes 

Permission Denied: The application lacks write access to the folder. Disk Space: The storage device is full or near capacity.

File Lock: Another program is currently using or scanning the ROM file.

Path Errors: The directory path contains invalid characters or is too long.

Antivirus Interference: Security software blocked the write operation.  🛠️ Troubleshooting Steps  Check Permissions: Run the application as an Administrator. Avoid special characters in filenames or path (e

Change Directory: Try saving to a simple path like C:\Saves.

Verify Storage: Ensure there is at least 100MB of free space.

Disable Sync: Turn off OneDrive or Dropbox syncing for that folder.

Audit File Name: Remove special characters (symbols, non-English letters).  To help me give you a specific fix, could you tell me:  Which emulator or software are you using? Is this a handheld device (like a Miyoo Mini) or a PC? Does this happen with every game or just one? 

I can provide the exact folder settings or config changes once I know the software!  or syncing tools like OneDrive).

This error is a known issue typically associated with the Universal Pokemon Randomizer (UPR) when it fails to write a modified file to your computer. It usually indicates a conflict between the software's settings and your system's environment rather than a "broken" game. Quick Troubleshooting Steps

Check Disk Space: Ensure you have enough free space on the drive where you are saving the ROM. Large files like Ultra Sun/Moon may require at least 6 GB of free space to process.

Run as Administrator: Right-click the randomizer executable and select "Run as Administrator" to ensure it has the necessary permissions to write files to your chosen folder.

Use a Clean ROM: If you are using a previously patched or "trimmed" ROM, it may cause an exception. Try using a completely unmodified, original ROM file.

Simplify the Save Location: Try saving the new ROM directly to your Desktop or Documents folder rather than deep within nested folders or protected system directories. Advanced Solutions 2. File/folder path problems

Update Java: Ensure you are running the latest version of Java 8 (x64), as outdated versions are a common source of unhandled exceptions in this tool.

Toggle Specific Settings: Certain settings (like "Type-Themed Trainers" in older versions) can sometimes cause the saving process to hang or crash. Try disabling any complex experimental settings to see if it saves correctly.

Check for an Error Log: UPR usually generates a file named error_[date].txt in its main folder. Open this to find the specific "RandomizerIOException" which can pinpoint if the issue is a "File Not Found" or "Access Denied" error.

Which game and randomizer version are you using? Providing those details can help narrow down if there's a known bug with that specific combination. [Bug] Issue by 'Randomize (Save)' #771 - GitHub

Incident Report: Unhandled Exception During ROM Save to Disk

Report ID: ERR-ROM-2026-04-18-01
Date of Occurrence: April 18, 2026
Reported By: System / User
Affected Component: Emulator / ROM Management Module
Severity: Medium – User data loss possible; operation interrupted

2. File/folder path problems

• Avoid special characters in filenames or path (e.g., é, #, &).
• Shorten the file name and path length (e.g., save to C:\ROMs\myrom.gba instead of deep subfolders).
• Make sure no other program has the file open (close other emulators, hex editors, or syncing tools like OneDrive).

8. Conclusion

The unhandled exception when saving a ROM to disk stems from inadequate error handling around file I/O operations. While the issue does not crash the entire application, it disrupts user workflow and risks data loss. Implementing proper exception handling, user feedback, and pre-save validation will resolve the problem.

Next Steps:

• Patch the save routine with try-catch blocks.
• Release updated version with improved error messaging.
• Add disk space and permission checks before save attempt.