Emulator

What's the problem?
Boot up Rock Band 3, and a message appears:
"There is not enough available space in the Wii System Memory.

Either move the data to an SD Card or delete data in the Wii console's Data Management screen."

Now I do have the SD card enabled in the Wii tab of the setup dialog but it makes no difference as far as this goes.

Dolphin version with the problem (as it appears in the title bar, Ex.: "R
4779" or "R 6403M"):
r7039

Operating system and version: Windows XP x86 Service Pack 3
32-bit or 64-bit: x86

Game ID (as it appears in game properties, Ex.: "GZ2P01" or "RSBE01"):
SZBE69 Rock Band 3 (NTSC USA)

Was the ISO a plain dump from disc, compressed and/or scrubbed?
Plain dump

Please provide any additional information below.
I sure as hell don't have this problem with any other Wii games that I have. Not even Guitar Hero Van Halen.