[modeller_usage] initial model error

[albert <>]

Hi:
  I would like to build a model staring from my own model. but it didn't work, it is said:

-------log--------------
_modeller.ModellerError: rdpdb___303E> No atoms were read from the specified input PDB file, since the starting residue number and/or chain id in MODEL_SEGMENT (or the alignment file header) was not found; requested starting position: residue number " ", chain " "; atom file name:  init.pdb
--------------------------

In fact in the alignment file I already add  something like this:

-------------------align----------------------------
>P1;seq
sequence:seq:     : :     : ::: 0.00: 0.00
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
>P1;init
structureX:init.pdb:1    :A: :A:::-1.00:-1.00
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
>P1;temp
structureX:temp.pdb:1    :A: :A:::-1.00:-1.00
aaaaaaaaaaaaaaaaaabbbbbbbbbbbb

----------script-------------------------------------
class MyModel(automodel):
    def special_restraints(self, aln):
        rsr = self.restraints
        at = self.atoms
#       Two beta-strands:
        rsr.add(secondary_structure.strand(self.residue_range('146:', '150:')))
        rsr.add(secondary_structure.strand(self.residue_range('156:', '161:')))

a = MyModel(env, 
        alnfile='mult.ali',
                 knowns=('tempA'), 
        sequence='my',
        inifile  = 'init.pdb')

a.starting_model = 1
a.ending_model = 2
----------------------------------------------------------------------------

the seq and init share the same sequences. The starting model init.pdb contains a china named A.


could you give me some advices?
THX