Why am I getting an 'Error Reading File' message in PPSSPP?

The 'Error Reading File' message in PPSSPP usually indicates a problem with the ISO/CSO file itself, the location it's stored, or PPSSPP's access permissions. Common causes include corrupted files, incorrect file extensions, insufficient storage space, or the file being locked by another program. Try verifying the ISO/CSO's integrity, moving it to a different location, ensuring you have enough free space, and closing any other programs that might be accessing the file.