So long story short (someone correct me if I'm wrong) in the game root directory is a folder labeled sce_sys. In this folder is a folder labeled modules, and in this folder are various files that make the game run.
Certain games when dumped either are missing required module files or they become corrupt resulting in a certain error when launching. Some people have discovered that they can replace the modules from one game into a non working dump to make it run. The success rate for this fix seems to be between 40 and 50 percent.