When running the following command in an Ubuntu 14.04 VM in a 14.04 host, I get a mount: protocol error

mount -t vboxsf -o uid=1000,gid=1000 updatable /opt/apps/directory/updatable

Guest additions are correct, updatable is currently mounted (according to mount) on /media/sf_updatable, I've rebooted so everything should be in sync. I've tried lots of things but I don't know what the protocol error means or what I'm looking to solve.

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