Double doors not opening?

Okay so I have these two doors that are supposed to open in the same direction, but it’s currently not doing so.

http://yougold.org/shorting/screenshots/gmod/galrp/rp_downtown_v4c_v2_v2_d0045.jpg

Name both of the doors “doordouble1” or something

Name both doors and then double click on one of the doors and go to the slave option and add the other door and they will both open at same time.