During task sequence, computer will not join workgroup

Here is a link to the relevant smsts.log: http://pastebin.com/raw.php?i=wf6CzD94

Doing a build task sequence, and it gets through to the point where it is about to pull an image from the machine, but it doesn't join the workgroup!

Computer is part of domain 'DOMAIN', disjoin and start image capture    PrepareOS    6/16/2014 6:39:24 PM    3000 (0x0BB8)

As you can see, I told it to join the workgroup, but for some reason it did not do so?

Parsing step node: Join Workgroup    TSManager    6/16/2014 6:37:18 PM    2112 (0x0840)

Screenshot of the step showing the relevant step: http://i.imgur.com/rmQFnuE.png