Hi, I tryed cf and gbfs vers of the programme and I'va the same problem: FAT failed to initialize

It's because I used micro-SD ?? or because I did bad thinks??
PS: I put scripts directory at different place on my card (root, same directory than homebrew file, .lua files in directory than homebrew file and finally, .lua files on root of my media)
please! help me!! I want code on my ds!!!!!
thanks, and sorry for bad english