unable to start services

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Warning, could not highlight error! No parser for error message found: 2012-06-01 05:04:04 Cannot open main log file "/var/log/exim_mainlog": Permission denied: euid=47 egid=12
2012-06-01 05:04:04 Failed to get user name for uid 0
2012-06-01 05:04:04 Cannot open main log file "/var/log/exim_mainlog": Permission denied: euid=47 egid=12
exim: could not open panic log - aborting: see message(s) above

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When we try and access a site via cpanel, we also get the following error:
Unable read /etc/passwd. /etc/passwd MUST be world readable under UN*X operating systems

In order to get this issue resolved :

Check your / partition permission it needs to set as 755

:)