The object name in Zmod has to match the name of the .v3o file. As example:
I would have to export this as "bme_model34.v3o" or it'll error out as it did for you.
To change the name, you can either click on the model (highlighted blue here) twice, slowly, and change the name there, or you can right click, select properties, and change the name in that 'menu.'
Hope this helps!