Having issues with Essentials warp signs.

Okay, so I set the warps to different places that I want to warp to by using command /setwarp (name.) I enabled warp signs in the Essentials config file and then I make a sign using [Warp] and put the name on the second line. The [Warp] turns red and gives me the error "This warp does not exist." However, when I actually type the command /warp (name), it takes me to that warp zone. What am I doing wrong?