The Window keeps on loading,I've kept waiting for one hour.I'm using Ubuntu 13.04.I've used
sudo update-software-center
But it does not work.
on running the Command: software-center
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk- widgets.css:202:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:209:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:217:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:246:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:253:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:482:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:501:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:516:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:529:26: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1162:22: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1167:22: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1212:48: Expected ')'
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1223:48: Expected ')'
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1235:48: Expected ')'
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1247:48: Expected ')'
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1429:18: Not using units is deprecated. Assuming 'px'.
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1437:18: Not using units is deprecated. Assuming 'px'.
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1465:26: not a number
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1474:26: not a number
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1490:18: Not using units is deprecated. Assuming 'px'.
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1535:5: '/*' in comment block
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk-widgets.css:1921:22: 'none' is not a valid color name
(software-center:4276): Gtk-WARNING **: Theme parsing error: gtk- widgets.css:1928:22: 'none' is not a valid color name
2014-01-28 18:48:02,299 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2014-01-28 18:48:05,005 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2014-01-28 18:48:05,038 - softwarecenter.plugin - INFO - activating plugin '<module 'webapps_activation' from '/usr/share/software- center/softwarecenter/plugins/webapps_activation.pyc'>'
2014-01-28 18:48:05,057 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/gi/importer.py', 51, 'find_module')'
2014-01-28 18:48:05,057 - root - ERROR - Could not find any typelib for LaunchpadIntegration
2014-01-28 18:48:05,308 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
Any help is appriciated. Thank you!