Door must be unlocked before cage is built

[Mattk50]

This is an odd one, for some reason my characters refuse to construct this cage until the door is unlocked and open. Order them to build it, they run to the door to unlock it:

https://dl.dropbox.com/u/16970274/Scree ... -16-35.png

Then once its unlocked and open they always run to actually build it.

https://dl.dropbox.com/u/16970274/Scree ... -31-77.png

[Captain Deathbeard]

Thanks, I fixed it.