does anyone know how to fix this glitch?

In the second picture, it looks like the rig isn't set up right. The leg bones need to be children of the root/hip bone, and the foot bones need to be children of the leg bones. Generally speaking, if you see red on the avatar's Body configuration, animation isn't going to work.

 

Even if I fix the hierarchy of the bones the error still remains...

 

After you fix the hierarchy, does the automapping work? Is the avatar all green, or are the legs still red?

 

this is the result after i forced the hierarchy in unity, avatar is all green, but the character is glitched

 

It's getting there -- all's green now!

When you inspect the animation to import it, does it play correctly in the Inspector view? If not, make sure you're not masking out the legs.

If it plays correctly in the Inspector view, then maybe the problem is with your animator controller. Your base layer shouldn't mask out anything with an avatar mask.

 

if you know how to fix can you explain me the steps that i have to do? im noob
if you want i can pass you my project even blender model...

 

Try these steps:

1. Click on your blender model.
2. In the Inspector view, click on the Animations tab.
3. Click on your clip in the list.
4. Press the Play button near at the bottom of the Inspector view:

If the animation does does not play correctly, expand the Mask foldout. Make sure everything is the default and that it's not excluding parts of the model.

If the animation clip plays correctly, then your animation imported into Unity correctly. If this is the case, then:

1. Double-click your animator controller to open the Animator view.
2. Select the base layer. Make sure it does not have an avatar mask assigned to it.

 

still the same problem, i followed yuor instruction but nothing have changed.
But, in the inspector i can see there is a piece of right foot that follow the movement of left foot in all animations...
in blender no.
I dont understand why...

 

In the avatar configuration, make sure all the bones are mapped correctly.

 

I fixed it, it was a blender problem...thank you