Hi , Getting an error while fetching mail

2013-12-24 09:09:08,789 3075 ERROR VEMPL1 openerp.addons.fetchmail.fetchmail: Failed to fetch mail from pop server Incoming Server.
Traceback (most recent call last):
  File "/home/server/workspace/openerp/openerp-7.0server/openerp/addons/fetchmail/fetchmail.py", line 220, in fetch_mail
    pop_server = server.connect()
  File "/home/server/workspace/openerp/openerp-7.0server/openerp/osv/orm.py", line 374, in function_proxy
    return attr(self._cr, self._uid, [self._id], *args, **kwargs)
  File "/home/server/workspace/openerp/openerp-7.0server/openerp/addons/fetchmail/fetchmail.py", line 151, in connect
    connection.pass_(server.password)
  File "/usr/lib/python2.7/poplib.py", line 189, in pass_
    return self._shortcmd('PASS %s' % pswd)
  File "/usr/lib/python2.7/poplib.py", line 152, in _shortcmd
    return self._getresp()
  File "/usr/lib/python2.7/poplib.py", line 128, in _getresp
    raise error_proto(resp)
error_proto: -ERR [AUTH] Authentication failed.