Problem solved! I was having a somewhat similar problem with Moonlight, in which one of the users found a solution from yet another similar problem with Retroarch.
https://gbatemp net/threads/problem-with-retroarch-and-sd2vita.488547/
Hey OP, if you're using MLTHaku, that is likely the cause for the issue. For some silly billy reason, It sets all your folder attributes to some crazy system file protection that Moonlight, Retroarch, and last but not least EasyRPG-Player doesn't know how to deal with.
You need to pop that microSD into your computer, hit Win + R, and enter
"attrib -H -S d:\*.* /D /S"
without the quotes.
Replace "d:" with the letter of your drive!!!
After a while that thing will fix the permissions in your folders, and everything will work like magic!
Thank you for trying to help folks~!