You chose to post in an OLD thread, which contains OLD solutions.
IOS249[56] (rev 20, Info: rev 20): Trucha Bug, NAND Access, USB 2.0
IOS250[38] (rev 20, Info: rev 20): Trucha Bug, ES Identify, NAND Access
That's the culprit. you are using a VERY old cIOS which is not compatible with DOL reloading.
You need d2x v7 or newer.
Recommended :
cIOS d2x v8 final base 57 in slot 249
OR
like greywolf said, watch the motion+ video once from an official disc.
OR
Watch the video from USBLoader game ISO :
go to your USBLoader game's settings, select "Alternative dol" option, choose the video.dol
launch the game, it will load the motion+ video, and exit to wii menu.
go to your USBLoader game's settings, de-select "Alternative dol" option, so it runs the game's dol instead of the video's dol
only the first solution will let you play all games without hassle.
the other two solution will have games not working without using the alt-dol method, even if you watched the video.
For example, SSX blur, Red steel, metroid prime trilogy, sam&max, etc.
update your cIOS and everything will fix by itself.