Last night my Supercard DSTWO started getting the "error occurred" message. This was after I used the micro SD on my PC to transfer some GBA games. My card never got this problem before and I ordered my card not even a month ago. I am on a 3ds XL. When I have time I will try reformatting the SD card when I have internet on my PC as I am in a new apartment and am posting from my phone. One other thing that I wonder about is if putting my card in a 3ds game case could have damaged my card. Seems weird but if it worked before then that may have been a cause. Soon I can try to test the card on someone I know's DS Lite. I will make sure I try that before reformatting as well. I have not done any updating on my 3ds XL and have played games with the DSTWO before. Thank you for any information about this problem and I hope to get back with more regarding my end with the issue.