Check your PMs
Also make sure the patch/crack you use is applied over original files, but you must back those original files up FIRST so you can always revert if its wrong.
I originally had the ACR duplex fix (1.00) applied over the original files, with my original eboot.bin (and other files)backed up as a copy and (for example) named eboot.bin.bak. When I updated to 1.04 and applied the N0DRM files to the update data folder (internal), I reverted the patched files from the 1.00 fix back to unmodified untouched files.
Ensure the param.sfo is in the correct folder too. Lots of people put it in the folder with the eboot.bin, but its should be one level up from there in the PS3_GAME folder.