Export to UDK problem

got this error when trying to export my character into UDK

Any idea how to solve it?

Try the latest version of blender (2.58)

New wersion gives me information that Mesh Object is not center. How do I center it?

I used the “Transform” box and set up the mesh object, as well as armature object to be at 0,0,0, but when trying to export, I get error message again saying that armature object is NOT center. … But it is (according to Transform panel)!