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Post Office is CRITICAL – SNMP server not responding, host down? | msg=0 undl=0 prob=0 csconn=0

I am stuck with this critical status “Post Office is CRITICAL – SNMP server not responding, host down? | msg=0 undl=0 prob=0 csconn=0”

-I already have SNMP running on the client machine do i also need to setup the SNMP on the nagios server itself?