The pin on your Vamo's 510 connection was pushed in too far; this is a very common problem with the VAMO. Pry it out gently a little bit to make contact with your tank.
http://www.e-cigarette-forum.com/forum/vamo/493321-v3-pin-rubber-grommet-replacement-mod.html
http://www.e-cigarette-forum.com/forum/vamo/375871-vamo-ohm-error-fix.html
http://www.e-cigarette-forum.com/forum/vamo/493321-v3-pin-rubber-grommet-replacement-mod.html
http://www.e-cigarette-forum.com/forum/vamo/375871-vamo-ohm-error-fix.html