Error Drawing Graph - from Distributed Poller

Hi there,

I am following the docs: https://docs.librenms.org/Extensions/RRDCached/, but I still got Error Drawing Graph from remote poller.

Details:
OS is Centos 7 (Apache), rrdtool is version 1.71, and rrdcached has been enabled.
show rrd command: ERROR: realpath(10.3.0.1/port-id127.rrd): No such file or directory

Can anyone please give me an advice on this?

Thanks

Jeff Deng