I have the game installed on my PS vita, the problem is when I enter because I get an error: saved core file succeeded
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That's a new one on me - might I suggest that you check over the install directories and make sure that everything is letter perfect. Please follow this video by TheTRON for clarification as an install guide, and could I also suggest disabling plugins as the project has been made with Unity and there's no way to debug what could be happening in that respect. Good luck!