Guide on adding a new model, animation, and creature to HoMMV

I exported the finished model in FBX format following the manual. In the process of working with Maya 6.0, I adjusted the sizes. After successfully exporting the skeleton, I exported the model itself (File (Model) => Right-click => Export), and the editor gives an error like "More than 1 model, cannot proceed." How can I fix this? Or is the problem with the model itself? If so, is there a way to make it a single model during the work in Maya? I hope for your help, thank you in advance!