I have a galaxy amp2 & i have 331 music videos that were trans to sd card & now they wont play on gallery, google photos & mk player. It says directory empty I have no idea what that means & I dont know how to fix it. I do not have a computer to hook it up to in order to fix it.. Can this b fixed just using my cell. Im not tech savy so please if u can let me know in a fashion i will b able to undrrstand i have a lil kmowledge but not much! Thank u