Help with error msg in nagios 2.8

[Rajagopal, Sam]

Trying to monitor a host in nagios2.8 env. For basic monitoring items, I
get the following error -

CPULoad   (Return code of 127 is out of bounds - plugin may be missing)
Disk [/x]   (Return code of 127 is out of bounds - plugin may be
missing)
Process   (Return code of 127 is out of bounds - plugin may be missing)

However ping checks ok. What am I missing here ? Is there any error log
for basic plugins ?

Thanks
Sam
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