I downloaded some songs in Rock Band 3 and had no problems playing them directly off the Wii memory. However whenever I load the game it prompts me to backup the DLC onto the SD card. When it tries to do so it gives an error message. It's also given me a message along the lines of, "add on content is out of date and cannot be restored to the wii system memory" in the main menu, after which no DLC appears in the song list. This is really bugging me and I have no idea how to resolve it. Accessing the music store and downloading songs works fine. The problem occurs when the game tries to back songs up to the SD card.