Console error with animation

Console says:
Default clip could not be found in attached animations list.
UnityEngine.Animation:Play()
Pepe4:Update() (at Assets/Standard Assets/Particles/Dust/Pepe4.js:114)

Help

Since there is not enough information in the question, I would point you to this forum thread: Legacy animations don’t work

Also another option is: In your project, select the model (.fbx or whatever file) then, in the Rig tab, set animation type to Legacy.