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Hi Tmpxyz!
Problem solved, I just found that I'd using the version 1.8.0 skele, and changed it into the latest version.
....and problem solved. The convert went perfect.

So sorry to bother you a lot. And thanks, tmpxyz.
Hi Tmpxyz,
I've done the same as you did in the video. Put the humanoid-character in the slot of converter, set to generic and click the button. Then put the converted-to-generic animation clip into the animator, and put the animator into the generic-character. I used the "HumanoidRun" animation of Ethan, the animation example character of standard asset which Unity provides, is that the reason why I failed?

Update editor log here.