Wii Sports Resort has the WiiMotion+ video you have to watch, if you've never played a WiiMotion+ game I'd be will to bet that's the problem.
I think there were 3 ways to fix the problem:
Play retail games and watch video,
Extract the WiiMotion+ video file from disk, rename it to main.dol and replace original main.dol to watch video
Use a loader with alt dol loading to watch video
There was also a flaw in 4.0 that made you have to watch the video again after playing Wiiware/VC game, but was fixed in 4.1 so you really only need to watch it once.