Error: flocker: plugin not found

[Nayana-ibm]

Hello,

I am trying to setup flocker on Intel x86 RHEL distribution .
I've followed the installation steps mentioned here however when I execute the following command to test if flocker-docker-plugin works:

docker run -v apples:/data --volume-driver flocker busybox sh -c "echo hello > /data/file.txt"

I get the error:

Error response from daemon: create apples: create apples: Error looking up volume plugin flocker: plugin not found.

The flocker-docker-plugin status shows the following:

systemctl status flocker-docker-plugin
● flocker-docker-plugin.service - Flocker Docker Plugin
   Loaded: loaded (/usr/lib/systemd/system/flocker-docker-plugin.service; enabled; vendor preset: disabled)
   Active: active (running) 

I have used loop back dataset as mentioned in https://docs.clusterhq.com/en/latest/flocker-features/loopback-configuration.html#loopback-dataset-backend.