I am getting this error when I run model-single.py

I am using windows 7 OS, modeller9.10, python3

The other commands (build_profile, align2d, compare) run successfully ….

C:\Program Files\Modeller9.10\bin\akt3>mod9.10 model-single.py

'import site' failed; use -v for traceback

Traceback (most recent call last):

  File "model-single.py", line 9, in ?

    a.make()

  File "C:\Program Files\Modeller9.10\modlib\modeller\automodel\automodel.py", l

ine 96, in make

    self.homcsr(exit_stage)

  File "C:\Program Files\Modeller9.10\modlib\modeller\automodel\automodel.py", l

ine 408, in homcsr

    aln = self.read_alignment()

  File "C:\Program Files\Modeller9.10\modlib\modeller\automodel\automodel.py", l

ine 398, in read_alignment

    aln.append(file=self.alnfile, align_codes=self.knowns+[self.sequence])

  File "C:\Program Files\Modeller9.10\modlib\modeller\alignment.py", line 78, in

 append

    allow_alternates)

_modeller.ModellerError: read_al_373E> Protein specified in ALIGN_CODES(i) was n

ot found in the alignment file; ALIGN_CODES(       1) =  3O96