[modeller_usage] help at second script

Hi,
While I was running the second script which is called compare.py and is the
following:

 from modeller import *

 env = environ()
 aln = alignment(env)
 for (pdb, chain) in (('1b8p', 'A'), ('1bdm', 'A'), ('1civ', 'A'),
                     ('5mdh', 'A'), ('7mdh', 'A'), ('1smk', 'A')):
    m = model(env, file=pdb, model_segment=('FIRST:'+chain, 'LAST:'+chain))
    aln.append_model(m, atom_files=pdb, align_codes=pdb+chain)
 aln.malign()
 aln.malign3d()
 aln.compare_structures()
 aln.id_table(matrix_file='family.mat')
 env.dendrogram(matrix_file='family.mat', cluster_cut=-1.0)

I recieved the following message and I don't know what to do.

 suse:/home/maria # mod9v3 compare.py
 Could not find platform independent libraries <prefix>
 Could not find platform dependent libraries <exec_prefix>
 Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
 'import site' failed; use -v for traceback
 Traceback (most recent call last):
  File "compare.py", line 7, in ?
    m = model(env, file=pdb, model_segment=('FIRST:'+chain, 'LAST:'+chain))
  File "/usr/lib/modeller9v3/modlib/modeller/model.py", line 23, in __init__
    self.read(**vars)
  File "/usr/lib/modeller9v3/modlib/modeller/model.py", line 68, in read
    model_format, model_segment)
 IOError: pdbnam_____E> Filename for PDB code not found: 1b8p
              Directories:
              Extensions : :.atm:.pdb:.ent:.crd
              (Also tried prepending 'pdb', and looking for .Z, .gz, .bz. .bz2)

Please, help me.