Hey guys, I had this error too. It was with the butterfly animation (purple with blue background) every time. I commented out the hold function in the config.ini file from that folder and it works now. Not sure why? Maybe my SD card had a bad block of memory there? Who knows, but it works now.
About the locked vs not locked of the SD card, be careful when inserting the card into the adapter. I would think it was not locked, insert it into my the adapter/my computer and it would be locked. I think the lock/unlock switch is easily toggled.