Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/http.py", line 500, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/http.py", line 517, in dispatch
    result = self._call_function(**self.params)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/http.py", line 283, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/service/model.py", line 113, in wrapper
    return f(dbname, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/http.py", line 280, in checked_call
    return self.endpoint(*a, **kw)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/http.py", line 733, in __call__
    return self.method(*args, **kw)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/http.py", line 376, in response_wrap
    response = f(*args, **kw)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 948, in call_button
    action = self._call_kw(model, method, args, {})
  File "/usr/lib/python2.7/dist-packages/openerp/addons/web/controllers/main.py", line 936, in _call_kw
    return getattr(request.registry.get(model), method)(request.cr, request.uid, *args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/api.py", line 237, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/module/module.py", line 450, in button_immediate_install
    return self._button_immediate_function(cr, uid, ids, self.button_install, context=context)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/api.py", line 237, in wrapper
    return old_api(self, *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base/module/module.py", line 498, in _button_immediate_function
    registry = openerp.modules.registry.RegistryManager.new(cr.dbname, update_module=True)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/modules/registry.py", line 324, in new
    openerp.modules.load_modules(registry._db, force_demo, status, update_module)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/modules/loading.py", line 358, in load_modules
    loaded_modules, update_module)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/modules/loading.py", line 263, in load_marked_modules
    loaded, processed = load_module_graph(cr, graph, progressdict, report=report, skip_modules=loaded_modules, perform_checks=perform_checks)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/modules/loading.py", line 149, in load_module_graph
    load_openerp_module(package.name)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/modules/module.py", line 312, in load_openerp_module
    __import__('openerp.addons.' + module_name)
  File "/usr/local/lib/python2.7/dist-packages/openerp-8.0_ebbfda9-py2.7.egg/openerp/modules/module.py", line 77, in load_module
    mod = imp.load_module('openerp.addons.' + module_part, f, path, descr)
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base_gs1_barcode/__init__.py", line 21, in <module>
    import gs1_barcode
  File "/usr/lib/python2.7/dist-packages/openerp/addons/base_gs1_barcode/gs1_barcode.py", line 27, in <module>
    import netsvc
ImportError: No module named netsvc