I'm trying to make an animation for a model I was provided with. The model is an imported OBJ file. I didn't do much with it, apart from scaling it to the size it's optimal to work with. I made a rigged skeleton that seems to be working just fine, but when I try to join in object mode the mesh to the armature with automatic weight painting the whole mesh falls apart. The connection is made in object mode with Control+P.
My question is how can I fix this problem?
I might add that I'm totally new to this whole thing and I'm learning.