Possible serious issue here! I use C#. My scene is like this the script to that scene is like this such scene used many times (like 100) and are combined in a tree like this Script works but at run I get this There is nothing more in the project.
You have to clear this its trying to set the mesh's skeleton to the root node's third parent.
spacecloud i did that its not the case. besides i tried to use not quad but plane mesh or cube mesh it did not fix the problem.