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java.lang.IllegalArgumentException: Plugin cannot be null	at org.bukkit.plugin.messaging.StandardMessenger.registerOutgoingPluginChannel(StandardMessenger.java:176)	at com.github.games647.scoreboardstats.variables.defaults.BungeeCordVariables.(BungeeCordVariables.java:32)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at com.github.games647.scoreboardstats.variables.ReplaceManager.createInstance(ReplaceManager.java:372)	at com.github.games647.scoreboardstats.variables.ReplaceManager.registerDefault(ReplaceManager.java:302)	at com.github.games647.scoreboardstats.variables.ReplaceManager.addDefaultReplacers(ReplaceManager.java:358)	at com.github.games647.scoreboardstats.variables.ReplaceManager.(ReplaceManager.java:86)	at com.github.games647.scoreboardstats.SbManager.(SbManager.java:27)	at com.github.games647.scoreboardstats.scoreboard.bukkit.BukkitScoreboardManager.(BukkitScoreboardManager.java:37)	at com.github.games647.scoreboardstats.ScoreboardStats.onEnable(ScoreboardStats.java:136)	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:292)	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.enablePlugin(CraftServer.java:373)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.enablePlugins(CraftServer.java:323)	at net.minecraft.server.v1_10_R1.MinecraftServer.t(MinecraftServer.java:412)	at net.minecraft.server.v1_10_R1.MinecraftServer.l(MinecraftServer.java:377)	at net.minecraft.server.v1_10_R1.MinecraftServer.a(MinecraftServer.java:332)	at net.minecraft.server.v1_10_R1.DedicatedServer.init(DedicatedServer.java:271)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:535)	at java.lang.Thread.run(Thread.java:745)