Signs problem

Hi guys. I can't use signs onmy server. I have only essentialsx 2.0.1 b-370 installed with bukkit 1.11.2 and I modified the config.yml removing the # from the signs I wanted to use. I don't understand why they don't work. Any suggestions? Thanks in advance
Here's the config file

I don't have any errors while in game, when I place the sign and use some code, like [Disposal], the result is a normal sign. I checked for some issue in the config code but I'm not really good with this things, it appears all correct to me. When I reach the part with the signs I readed I simply had to remove the #, I did it and it don't work, I'm also op in my server.

I tried to use different versions of bukkit: 1.8, 1.9 and 1.10 with essentialsx 2.0.1 b-370, but signs still don't work. I readed somewhere that it could be a permission problem but I don't use permissions. Suggestions?

Yeah I readed it many times, but what I understand is that I need to create permission nodes for essentials signs(I already removed the # in config file), but I haven't a permission plug-in, everyone can do what they want. I must install it anyway and add the nodes?

I installed vault then permissionsex and configured it, now essentials signs works. Thank you!