Can not mount virtualbox folder in fstab

I've just upgraded my VM from Ubuntu server 12.04 to 14.04.

I used to mount my data folder through fstab as follows:

datafolder  /mnt/DataFolder  vboxsf  uid=106,gid=113, dir_mode=0770 0 0

I had nothing in my rc.local, nor anything in my /etc/modules (as per some solutions on this site).

When I upgraded to 14.04 this all stopped working. I could manually mount the share using:

mount -t vboxsf datafolder /mnt/DataFolder

However, on boot I would get an error.

I know this question has been asked a lot, but none of the solutions seem to work for me.