[modeller_usage] unable to read structural information

[<>]

Hi all,
suppose I have the following simple "dummy" py-modeller script:

from modeller import *                  
from modeller.automodel import *        
log.verbose()
env = environ()                         

env.io.atom_files_directory = '<path to pdb>' # containing d1f0la3.pdb
a = automodel(env,
                alnfile = '<my_pir_file.pir>',    # alignment filename
                knowns  = 'd1f0la3',      # codes of the templates
                sequence ='d1f0la3')        # code of the target
a.starting_model = 1                   
a.ending_model = 3
a.make()

and the corresponding pir file:
>P1;d1f0la3
sequence:d1f0la3:   1: : 180: :f.1.2.1 (A;201-380) Diphtheria toxin, middle domain {Corynebacterium diphtheriae [TaxId; 1717]} PDB; d1ddta3 d1p3gb_ d1p3gf_ d1p3pb_ d1p3pf_ d1p3bf_ d1p3ib_: : 0.00: 0.00
CINLDWDVIRDKTKTKIESLKEHGPIKNKMSESPNKTVSEEKAKQYLEEFHQTALEHPELSELKTVTGTNPVFAGANYAAWAVNVAQVIDSETADNLEKT
TAALSILPGIGSVMGIADGAVHHNTEEIVAQSIALSSLMVAQAIPLVGELVDIGFAAYNFVESIINLFQVVHNSYNRPAY*
>P1;d1f0la3
structureX:d1f0la3: :A: :A:f.1.2.1 (A201-380) Diphtheria toxin, middle domain {Corynebacterium diphtheriae [TaxId 1717]} PDB d1ddta3 d1p3gb_ d1p3gf_ d1p3pb_ d1p3pf_ d1p3bf_ d1p3ib_:Corynebacterium diphtheriae [TaxId; 1717]:-1.00:-1.00
CINLDWDVIRDKTKTKIESLKEHGPIKNKMSESPNKTVSEEKAKQYLEEFHQTALEHPELSELKTVTGTNPVFAGANYAAWAVNVAQVIDSETADNLEKT
TAALSILPGIGSVMGIADGAVHHNTEEIVAQSIALSSLMVAQAIPLVGEL--IGFAAYNFVESIINLFQVVHNSYNRPAY*


Then I get the following error when executing the script:
Traceback (most recent call last):
  File "/cluster/tmp/armin/test/d1f0la3_d1f0la3_1.py", line 14, in <module>
    a.make()
  File "/cluster/bioprogs/modeller9v5_RSR/modlib/modeller/automodel/automodel.py", line 98, in make
    self.homcsr(exit_stage)
  File "/cluster/bioprogs/modeller9v5_RSR/modlib/modeller/automodel/automodel.py", line 425, in homcsr
    self.check_alignment(aln)
  File "/cluster/bioprogs/modeller9v5_RSR/modlib/modeller/automodel/automodel.py", line 407, in check_alignment
    aln.check()
  File "/cluster/bioprogs/modeller9v5_RSR/modlib/modeller/alignment.py", line 191, in check
    self.check_structure_structure(io=io)
  File "/cluster/bioprogs/modeller9v5_RSR/modlib/modeller/alignment.py", line 200, in check_structure_structure
    return f(self.modpt, io.modpt, self.env.libs.modpt, eqvdst)

_modeller.ModellerError: check_a_282E> Unable to read structural information for alignment sequence:        1  d1f0la3 This command requires structures.

Any ideas whats wrong?
Thanks in advance
Armin