Magos Opening Error

[NhazUl]

This model cannot be opened with Magos, because "Excepted "OutTan", got "" in group "Helper"!"

I want to know what may be the reason for this error and how to get rid of errors like this (if it is not too complicated to explain).

If you see the model, don't judge it now, it's far from finishing.

 

[skrab]

The model exporting or whatever is not finished right :S
you can see it on the pic

 

[NhazUl]

Strange... All I did were a few operations with Vertexmodify and GeosetMerger...