[Observium] observium NGINX report

I am trying to pulling nginx nginx_status from observium. But when I run the nginx script I got the following error:

./nginx <<<nginx>>>

Traceback (most recent call last): File "./nginx", line 35, in <module> Active = int(params["Reading"]) + int(params["Writing"]) + int(params["Waiting"]) KeyError: 'Reading'

Observium is not generating any graph for NGINX. Other SNMP query on that server is ok and I can view all report.

Thanks Fakrul