[chef] Problem starting chef-server and chef-server webui

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My EC2 instance rebooted, now I unable to restart chef-server. I get the
following:-

Loading init file from /usr/share/chef-server-webui/config/init.rb
[Wed, 08 Feb 2012 10:45:05 +0000] INFO: HTTP Request Returned 500 Internal
Server Error: ucs [Wed, 08 Feb 2012 10:45:05 +0000] ERROR: Server returned
error for http://localhost:5984/chef/design/users/view/all_id, retrying 1/5 in
4s [Wed, 08 Feb 2012 10:45:09 +0000] INFO: HTTP Request Returned 500 Internal
Server Error: ucs

Everything was working fine prior to the reboot. Any ideas anyone?

Thanks