Nagios access error

[nag ios]

When i am trying to access nagios through browser using

http://localhost/nagios/

its giving me the following error

 Forbidden

You don't have permission to access /nagios/ on this server.
------------------------------
Apache/2.2.13 (Fedora) Server at localhost Port 80

can u please help me and let me why does this error occurs ??????
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