i downloaded and paste the web_printscreen_zb module in addons.but when i run it i got the following error..

2014-04-29 04:47:49,831 3948 WARNING ? openerp.modules.module: Ambiguous import: the OpenERP module web is shadowed by another module (available at /usr/local/lib/python2.7/dist-packages/web.py-0.37-py2.7.egg/web). To import it, use import openerp.addons.<module>.. 2014-04-29 04:47:49,838 3948 CRITICAL ? openerp.modules.module: Couldn't load module web 2014-04-29 04:47:49,838 3948 CRITICAL ? openerp.modules.module: No module named controllers.main 2014-04-29 04:47:49,838 3948 ERROR ? openerp.service: Failed to load server-wide module web. The web module is provided by the addons found in the openerp-web project. Maybe you forgot to add those addons in your addons_path configuration. Traceback (most recent call last): File "/opt/openerp/server/openerp/service/__init__.py", line 60, in load_server_wide_modules openerp.modules.module.load_openerp_module(m) File "/opt/openerp/server/openerp/modules/module.py", line 416, in load_openerp_module getattr(sys.modules['openerp.addons.' + module_name], info['post_load'])() File "/opt/openerp/web/addons/web/http.py", line 628, in wsgi_postload openerp.wsgi.register_wsgi_handler(Root()) File "/opt/openerp/web/addons/web/http.py", line 517, in __init__ self.load_addons() File "/opt/openerp/web/addons/web/http.py", line 580, in load_addons m = __import__('openerp.addons.' + module) File "/opt/openerp/server/openerp/modules/module.py", line 134, in load_module mod = imp.load_module('openerp.addons.' + module_part, f, path, descr) File "/opt/openerp/addons/web_printscreen_zb/__init__.py", line 24, in <module> import controllers File "/opt/openerp/addons/web_printscreen_zb/controllers.py", line 28, in <module> from web.controllers.main import ExcelExport ImportError: No module named controllers.main