You need to download a different version of gpsp. The version you downloaded will only work on fat psps. You downloaded a version that was in 1.5 kernal, which is not supported on a slim unless you use timemachine(which is not worth it just to run 1.5 kernal homebrew). You need to download a version that is in 3.XX kernal. You can tell which kernal its in by the folders. If the eboot is just in one folder called gpsp, then you have the 3.XX kernal version. If it has two folders called gpsp% and gpsp, then you have the 1.5 kernal version. I am pretty sure the latest version is in 3.XX kernal, so just download the latest version and you should be fine.
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