I was having the same error, but another user in this thread provided a solution that worked for me. Looks like this has to do with cache management. Download a component+plugin called jotcache and disable caching for cb_comprofiler in the component.
nant thanks for your help I just solved that problem with your help. Can you tell me really quit whats that setting for?? how can I change the timezone in my Joomla 1.6 its Universal Time (Coordinated UTC)