Problem/Bug How to i enable PermissionsEX

I really need help when i turn my server on and i type pex in the console it gives me this error

Code:

[08:21:46] [Server thread/WARN]: Unexpected exception while parsing console command "pex"
org.bukkit.command.CommandException: Cannot execute command 'pex' in plugin PermissionsEx v1.23.4 - plugin is disabled.
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:36) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:634) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:444) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:407) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
[08:25:23] [Server thread/WARN]: Unexpected exception while parsing console command "pex"
org.bukkit.command.CommandException: Cannot execute command 'pex' in plugin PermissionsEx v1.23.4 - plugin is disabled.
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:36) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:634) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:444) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:407) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
[08:25:32] [Server thread/WARN]: Unexpected exception while parsing console command "pex help"
org.bukkit.command.CommandException: Cannot execute command 'pex' in plugin PermissionsEx v1.23.4 - plugin is disabled.
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:36) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:648) ~inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchServerCommand(CraftServer.java:634) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.DedicatedServer.aP(DedicatedServer.java:444) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:407) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) inecraft_server.jar:git-Spigot-642f6d2-57ab4cf]

 

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