CommandSigns help, No command.

so i installed commandsigns but when i do /commandsign on a sign it say Unknown Commands plz i need help

Heres My Console


Last login: Tue Oct 13 07:15:44 on ttys000
Elises-iMac:~ EliseMcKillop$ /Users/EliseMcKillop/server/CraftBukkit/start_server.command ; exit;
Loading libraries, please wait...
[07:53:56 INFO]: Starting minecraft server version 1.8
[07:53:56 INFO]: Loading properties
[07:53:56 INFO]: Default game type: SURVIVAL
[07:53:56 INFO]: Generating keypair
[07:53:56 INFO]: Starting Minecraft server on *:25565
[07:53:56 INFO]: This server is running CraftBukkit version git-Bukkit-1092acb (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT)
[07:53:56 INFO]: [Vault] Loading Vault v1.5.6-b49
[07:53:56 INFO]: [CommandSigns] Loading CommandSigns v1.7.9
[07:53:56 INFO]: [Vault] Enabling Vault v1.5.6-b49
[07:53:56 INFO]: [Vault] [Permission] SuperPermissions loaded as backup permission system.
[07:53:56 INFO]: [Vault] Enabled Version 1.5.6-b49
[07:53:56 INFO]: Preparing level "world"
[07:53:56 INFO]: Preparing start region for level 0 (Seed: 2209159146165018719)
[07:53:57 INFO]: Preparing start region for level 1 (Seed: 2209159146165018719)
[07:53:57 INFO]: Preparing start region for level 2 (Seed: 2209159146165018719)
[07:53:57 INFO]: [CommandSigns] Enabling CommandSigns v1.7.9
[07:53:57 INFO]: Server permissions file permissions.yml is empty, ignoring it
[07:53:57 INFO]: Done (1.178s)! For help, type "help" or "?"
[07:53:57 INFO]: [Vault] Checking for Updates ...
[07:53:59 INFO]: [Vault] No new version available
[07:54:11 INFO]: UUID of player CoolMan2727 is 292c0968-b734-4ed2-bb19-d6b760b88848
[07:54:11 INFO]: CoolMan2727[/10.0.0.78:57651] logged in with entity id 288 at ([world] -144.93166225610682, 73.14801406679325, 223.21423872210752)
[07:54:19 INFO]: CoolMan2727 issued server command: /pl
[07:54:24 INFO]: CoolMan2727 issued server command: /help
[07:54:31 INFO]: CoolMan2727 issued server command: /commandsigns
[07:55:00 INFO]: CoolMan2727 issued server command: /reload
[07:55:00 INFO]: [CommandSigns] Disabling CommandSigns v1.7.9
[07:55:00 INFO]: [Vault] Disabling Vault v1.5.6-b49
[07:55:03 ERROR]: Nag author: 'cereal' of 'Vault' about the following: This plugin is not properly shutting down its async tasks when it is being reloaded. This may cause conflicts with the newly loaded version of the plugin
[07:55:03 ERROR]: Nag author: 'shmkane' of 'CommandSigns' about the following: This plugin is not properly shutting down its async tasks when it is being reloaded. This may cause conflicts with the newly loaded version of the plugin
[07:55:03 INFO]: [CommandSigns] Loading CommandSigns v1.7.9
[07:55:03 INFO]: [CommandSigns] Enabling CommandSigns v1.7.9
[07:55:03 INFO]: Server permissions file permissions.yml is empty, ignoring it
[07:55:03 INFO]: CoolMan2727: Reload complete.
[07:55:03 WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2730ms behind, skipping 54 tick(s)

 

Your log says you've got CommandSigns v1.7.9 which is insanely outdated. Get the (current) latest version here:
http://dev.bukkit.org/bukkit-plugins/command-signs/files/54-v1-9-3-2/