exceptions.Error does not exist

[yong sheng gong]

    def add_extension(self, ext):
        # Do nothing if the extension doesn't check out
        if not self._check_extension(ext):
            return

        alias = ext.get_alias()
        LOG.info(_('Loaded extension: %s'), alias)

        if alias in self.extensions:
            raise exceptions.Error(_("Found duplicate extension: %s") %
                                   alias)
        self.extensions[alias] = ext

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/52906

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/52906
Committed: http://github.com/openstack/neutron/commit/7d44629c2e8003f5bbb87e9b697eec54b4cce793
Submitter: Jenkins
Branch: master

commit 7d44629c2e8003f5bbb87e9b697eec54b4cce793
Author: Yong Sheng Gong <email address hidden>
Date: Mon Oct 21 20:26:36 2013 +0800

    Replace a non-existing exception

    Closes-Bug: #1242662

    Change-Id: Ie44023c0fd9ba1373ec6e62d9245884b9f719b7e