Animations get a "NullRefrenceException" error when playing animations.

I imported an fbx model i made in blender, which has animations, since i wanted to animate some other things & program them into my game (like attacks & such), Set the animation Rig of the model to "Legacy", but whenever i use an animation onto my model, my model gltiches while playing the animations. I tried re-exporting the model, nothing works. Please help me if you can. I have a video of it so you know what im talking about: https://www.youtube.com/watch?v=uEHL58zqcwc

Unity version is 4.6.2f1