Motion matching Stuff, no database assets provided for motion matching

I am doing some motion matching tests and this happened. I have two nested choosers in main chooer, called Stop and Run, and there are two PSDs in Stop nested chooser called Idle and Stop as th screen shot below. I can figure out that the problem occurs when I try to stop the character in game, but I can’t find where the problem is. Can any one good at this help me with this? Thank you!

Besides, is there away to delete a empty data asset like the PSD_Stop in the red box of the picture below? When I try to clear it then run the game, the engine just quit. Thank you !!!

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