[modeller_usage] Number of equivalent positions <3

Dear users,

I am getting this error, when I am running modeller (sailing.py): _modeller.ModellerError: fit2xyz_296E> Number of equivalent positions < 3: 0  I am trying to make a multi-template model to reconstruct a loop region for a protein. I am using a experimental structure of the loop (it has only 7 aminoacids), and several whole structures from the PDB and derived from modeller. There is any way to force the alignement or to solve this problem?

Thanks for your attention,

Hocine El Khaoudi Enyoury