A friend is trying to export from Maya to Unreal engine, but she is having the following issues :

I want to use a polygon based object that i have created in maya 2011and export it to unreal engine2 to use in this virtual environment I am creating. I turned on the option in the plug in manager section to allow for export of .dae files but when i came to export it errors occurred. -

While reading or writing a file the following notifications have been raised.
Warning: Null not supported by COLLADA. Node pCube1 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node polySurface1 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node transform5 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node polySurface2 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node transform4 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node polySurface3 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node transform3 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node transform1 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node pCube2 will lose its geometric information. The node transforms will be saved.
Warning: Null not supported by COLLADA. Node transform2 will lose its geometric information. The node transforms will be saved.


Any help, much appreciated.