Remove Minecraft Plugin Error?

I rewrote a Minecraft plugin in 1.14 a bit (only 1 or 2 messages).

Now comes this message:

[19:48:39 ERROR]: Error occurred while enabling Manager v.3.0 (Is it up to date?)

java.lang.Error: Unresolved compilation problems:

mplayer can't be resolved to a variable

mplayer can't be resolved to a variable

mplayer can't be resolved to a variable

at me.h1dd3nxn1nja.chatmanager.hooks.HookManager.loadDependencies (HookManager.java:52) ~ [?:?]

at me.h1dd3nxn1nja.chatmanager.Main.onEnable (Main.java:28) ~ [?:?]

at org.bukkit.plugin.java.JavaPlugin.setEnabled (JavaPlugin.java:263) ~ [patched_1.14.4.jar: git-Paper-174]

at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin (JavaPluginLoader.java:338) ~ [patched_1.14.4.jar: git-Paper-174]

at org.bukkit.plugin.SimplePluginManager.enablePlugin (SimplePluginManager.java:420) ~ [patched_1.14.4.jar: git-Paper-174]

at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugin (CraftServer.java:467) ~ [patched_1.14.4.jar: git-Paper-174]

at org.bukkit.craftbukkit.v1_14_R1.CraftServer.enablePlugins (CraftServer.java:381) ~ [patched_1.14.4.jar: git-Paper-174]

at net.minecraft.server.v1_14_R1.MinecraftServer.a (MinecraftServer.java:474) ~ [patched_1.14.4.jar: git-paper-174] at net.minecraft.server.v1_14_R1.DedicatedServer.init (DedicatedServer.java: 290) ~ [patched_1.14.4.jar: git-paper-174]

at net.minecraft.server.v1_14_R1.MinecraftServer.run (MinecraftServer.java:870) ~ [patched_1.14.4.jar: git-paper-174]

at java.lang.Thread.run (Unknown Source) [?: 1.8.0_211]

How can I prevent this?

Please ask for something in Spigot / Bukkit forum, because there are people who code dominate, here you can't necessarily hope for a good answer (Especially if you have the error here so pure and without source code).

Poste first the program code on Pastebin / Hastebin, only the error message brings us nothing.

edit:

Presumably mplayer is not declared, where did you get the variable from?

How? Program code. I've downloaded the ChatManager plugin from Spigot, it declares everything edited with Eclipse, and then exports it again.

The section of the plugin you have edited.

Upload him eg here:

https://pastebin.com/