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[modeller_usage] disulfide building problem

Dear All,
 I want to build a model including 3 disulfide bridges, but my script could not build bridges while modelling. Can you give me some suggestion on how to make the bridges-making script work?

from modeller import *
from modeller.automodel import *

env = environ()

env.schedule_scale = physical.values(default=1.0, soft_sphere=0.7)
env.io.atom_files_directory = ['.', '../atom_files']

a = automodel(env, alnfile='GBSS1-mult.ali',knowns=('2r4tA','3copA','3cx4A'), sequence='GBSS1')

class automodel:
    def special_patches(self, aln):
        self.patch(residue_type='DISU', residues=(self.residues['151'],self.residues['181']))
        self.patch(residue_type='DISU', residues=(self.residues['422'],self.residues['448']))
        self.patch(residue_type='DISU', residues=(self.residues['420'],self.residues['482']))

a.starting_model =1
a.ending_model = 60

a.library_schedule = autosched.slow
a.max_var_iterations = 300

a.md_level = refine.very_slow

a.repeat_optimization = 8
a.max_molpdf = 1e8


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