I am having a problem with the McMMO plugin!

[00:16:08 ERROR]: [mcMMO] There was an error while enabling mcMMO!
[00:16:08 WARN]: java.lang.NullPointerException
[00:16:08 WARN]: at java.io.Reader.<init>(Reader.java:78)
[00:16:08 WARN]: at java.io.InputStreamReader.<init>(InputStreamReader.java:72)
[00:16:08 WARN]: at com.gmail.nossr50.metrics.MetricsManager.setup(MetricsManager.java:72)
[00:16:08 WARN]: at com.gmail.nossr50.mcMMO.onEnable(mcMMO.java:173)
[00:16:08 WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321)
[00:16:08 WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340)
[00:16:08 WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405)
[00:16:08 WARN]: at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357)
[00:16:08 WARN]: at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317)
[00:16:08 WARN]: at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:199)
[00:16:08 WARN]: at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525)
[00:16:08 WARN]: at java.lang.Thread.run(Thread.java:745)
[00:16:08 INFO]: [mcMMO] Disabling mcMMO v1.5.00-b3547

This is what it is constantly telling me when I restart my server..