Warehouse.mdl: Can`t open file!

I exported with WED the warehouse building from the Warehouse Demo with the option; "File//Export//Export to MDL7 file"

It seemed to work perfecktly, but when I start my level with the exported model, it shows up the warning;
"Warehouse.mdl: Can`t open file" "I called the exported model from WED warehouse".

As I exported i choosen the options;
"Add WMB Entity, Add Model Entity, Merge All, Merge Groups, Faces seperation, Save Texture Extern"

I have 3dgs A8 comm.

I hope somebody can help me with this problem.
Thanks.

Find out problem myself.
I forgot to add a path to the model and it`s textures...

thanks anyway.