muscleClip missing hips

I everyone, I got a huge problem and I hope that someone can help me because I cant continue with mecanim if not.

My plan is to make a game where players will be able to cutomise their character. So I use a simple mesh from mixamo that I plan to change later. I took mixamo's mesh and skinned it on a skeleton of mine ( in 3ds max max 2015). that is my model. From the same scene, without the mesh, I made an Idle animation and a walking animation. No problem until my third animation, a running. It wasn't moving at all, it was like the pose in the muscle pannel(the one where the character seems to be riding an invisible bike). So I made it a second time, but it didn't work and I notice this warning : MuscleClip 'Alpha@running' conversion failed: Required human bone 'Hips' not found UnityEditor.DockArea:OnGUI() So I made sure the hips was present and it was but I figured out the problem was in my bone hierarchy. -I tried an other hierarchy, changing both, the model and the animation. -I made the hierarchy out of dummy, with 3dsmax's bones, with a biped. -I compare with the IDLE and WALKING animation. -I cheked and uncheked a lot of unity's options. -I tried one or two script. -I search google, youtube, this forum and others. I wasted a month of my life on this and am not wasting a second so I hope someone can help me ... cuz I can do anything...wich is so weird...