Error message when I start nagios

[Geon Reuben]

Hi all:
I am new to nagios so please excuse my naivete with regards to it.
When I start up nagios ( nagios v 1.2 on Sun OS 10 ), I get the following error messages on the console
****************
ld.so.1: /usr/local/nagios/libexec/check_http: fatal: libiconv.so.2: open failed: No such file or directory
Killed
Warning: Return code of 137 for check of service 'HTTP' on host 'dev1' was out of bounds.
*****************

Can you guys point me to the what is wrong here. 
Thanks in advance.

- Reuben
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