'ZODB.POSException.POSKeyError'

After logging into Zenoss, below error return. When trying to access any other page, zenoss will return to logon window. How to fix the problem Much appreciated.

Type:
Value: 0x0a495c

Traceback (most recent call last):
File "/opt/zenoss/lib/python/ZPublisher/Publish.py", line 126, in publish
request, bind=1)
File "/opt/zenoss/lib/python/ZPublisher/mapply.py", line 77, in mapply
if debug is not None: return debug(object,args,context)
File "/opt/zenoss/lib/python/ZPublisher/Publish.py", line 46, in call_object
result=apply(object,args) # Type s to step into published object.
File "/opt/zenoss/Products/ZenUtils/patches/pasmonkey.py", line 153, in login
pas_instance.updateCredentials(request, response, login, password)
File "/opt/zenoss/lib/python/Products/PluggableAuthService/PluggableAuthService.py", line 1100, in updateCredentials
updater.updateCredentials(request, response, login, new_password)
File "/opt/zenoss/lib/python/Products/PluggableAuthService/plugins/SessionAuthHelper.py", line 102, in updateCredentials
request.SESSION.set('__ac_name', login)
File "/opt/zenoss/lib/python/ZPublisher/HTTPRequest.py", line 1379, in __getattr__
v = self.get(key, default, returnTaints=returnTaints)
File "/opt/zenoss/lib/python/ZPublisher/HTTPRequest.py", line 1336, in get
v = v()
File "/opt/zenoss/lib/python/Products/Sessions/SessionDataManager.py", line 101, in getSessionData
return self._getSessionDataObject(key)
File "/opt/zenoss/lib/python/Products/Sessions/SessionDataManager.py", line 188, in _getSessionDataObject
ob = container.new_or_existing(key)
File "/opt/zenoss/lib/python/Products/Transience/Transience.py", line 839, in new_or_existing
item = self.get(key, _marker)
File "/opt/zenoss/lib/python/Products/Transience/Transience.py", line 495, in get
item = self._move_item(k, current_ts, default)
File "/opt/zenoss/lib/python/Products/Transience/Transience.py", line 285, in _move_item
self._housekeep(current_ts)
File "/opt/zenoss/lib/python/Products/Transience/Transience.py", line 934, in _housekeep
self._finalize(now)
File "/opt/zenoss/lib/python/Products/Transience/Transience.py", line 574, in _finalize
self._do_finalize_work(now, max_ts, start_finalize)
File "/opt/zenoss/lib/python/Products/Transience/Transience.py", line 598, in _do_finalize_work
values = list(self._data[key].values())
File "/opt/zenoss/lib/python/ZODB/Connection.py", line 860, in setstate
self._setstate(obj)
File "/opt/zenoss/lib/python/ZODB/Connection.py", line 901, in _setstate
p, serial = self._storage.load(obj._p_oid, '')
File "/opt/zenoss/lib/python/relstorage/storage.py", line 476, in load
raise POSKeyError(oid)
POSKeyError: 0x0a495c