Bukkit

What steps will reproduce the problem?
1.Placing a sign
2.Write nothing or anything.
3.Close sign menu

What is the expected output? What do you see instead?
Sign is meant to say the characters on sign. Instead my friend gets [WarpSigns] You do not have permission to do that

What version of the product are you using?
5.2

Do you have an error log of what happened?
No because my console is always being spammed and it'd take me ages to find it.

Please provide any additional information below.
The only permission this player has for this plugin is WarpSigns.use and he is able to use the Warp Signs I've created