Not Found 404 for http://localhost/hobbit

hi,
i have installed xymon xymon-4.2.2-RC1 with rrdtool 1.2.2.Now i am getting
error
The requested URL /hobbit was not found on this server when i give
http://ipaddr/hobbit
I get error,
Tried to down BOARDBUSY: Invalid argument
i have cgi-bin settings as /home/xymon/cgi-bin .i.e. all default setting
stated by xymon configure file..
please help


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Pankaj V. Dorlikar