Docker swarm mode scale service issue with one worker

So, I am trying out Docker swarm mode in 1.12. Initially it took me time to figure out the mounts during docker service create, but I got that part to work. Now when I try to scale, it gives me the below error:

invalid bind mount source, so…

Is this error happening because I only have one worker and the mount is already set ?

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    Need some help with this.

    Thanks,
    Jason

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