i got error while  running my pylons application.it show error in
lib/helpers.py  file .


code of helper.py is as follow


from formbuild.helpers import field
from formbuild import start_with_layout as form_start, end_with_layout as
form_end
from webhelpers.html.tags import *
from routes import url_for

error is look like as follow:


Traceback (most recent call last):
  File "/home/varsha_mca3/virtualenv-1.5.1/env/bin/paster", line 8, in
<module>
    load_entry_point('PasteScript==1.7.3', 'console_scripts', 'paster')()
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteScript-1.7.3-py2.6.egg/paste/script/command.py",
line 84, in run
    invoke(command, command_name, options, args[1:])
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteScript-1.7.3-py2.6.egg/paste/script/command.py",
line 123, in invoke
    exit_code = runner.run(args)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteScript-1.7.3-py2.6.egg/paste/script/command.py",
line 218, in run
    result = self.command()
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteScript-1.7.3-py2.6.egg/paste/script/serve.py",
line 276, in command
    relative_to=base, global_conf=vars)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteScript-1.7.3-py2.6.egg/paste/script/serve.py",
line 313, in loadapp
    **kw)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 203, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 223, in loadobj
    global_conf=global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 247, in loadcontext
    global_conf=global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 270, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 401, in get_context
    section)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 423, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 353, in get_context
    global_conf=global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 247, in loadcontext
    global_conf=global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 277, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 553, in get_context
    object_type, name=name)
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/PasteDeploy-1.3.4-py2.6.egg/paste/deploy/loadwsgi.py",
line 579, in find_egg_entry_point
    possible.append((entry.load(), protocol, entry.name))
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg/pkg_resources.py",
line 1954, in load
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/pylonsforum/pylonsforum/config/middleware.py",
line 12, in <module>
    from pylonsforum.config.environment import load_environment
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/pylonsforum/pylonsforum/config/environment.py",
line 10, in <module>
    import pylonsforum.lib.helpers
  File
"/home/varsha_mca3/virtualenv-1.5.1/env/pylonsforum/pylonsforum/lib/helpers.py",
line 6, in <module>
    from formbuild.helpers import field
ImportError: No module named helpers
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