Error

3:28:54 PM [SEVERE] GroupManager - SEVERE - ===================================================
3:28:54 PM [SEVERE] GroupManager - SEVERE - = ERROR REPORT START - 2.0 (2.9.6) (Phoenix) =
3:28:54 PM [SEVERE] GroupManager - SEVERE - ===================================================
3:28:54 PM [SEVERE] GroupManager - SEVERE - === PLEASE COPY AND PASTE THE ERROR.LOG FROM THE ==
3:28:54 PM [SEVERE] GroupManager - SEVERE - = GROUPMANAGER FOLDER TO AN ESSENTIALS  DEVELOPER =
3:28:54 PM [SEVERE] GroupManager - SEVERE - ===================================================
3:28:54 PM [SEVERE] GroupManager - SEVERE - null
3:28:54 PM [SEVERE] GroupManager - SEVERE - ===================================================
3:28:54 PM [SEVERE] GroupManager - SEVERE - = ERROR REPORT ENDED =
3:28:54 PM [SEVERE] GroupManager - SEVERE - ===================================================
3:28:54 PM [SEVERE] Error occurred while enabling GroupManager v2.0 (2.9.6) (Phoenix) (Is it up to date?)
java.lang.IllegalArgumentException
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:232)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:87)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugin(CraftServer.java:278)
at org.bukkit.craftbukkit.v1_4_6.CraftServer.enablePlugins(CraftServer.java:260)
at net.minecraft.server.v1_4_6.MinecraftServer.j(MinecraftServer.java:321)
at net.minecraft.server.v1_4_6.MinecraftServer.e(MinecraftServer.java:300)
at net.minecraft.server.v1_4_6.MinecraftServer.a(MinecraftServer.java:259)
at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:149)
at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
at org.anjocaido.groupmanager.utils.Tasks.copy(Tasks.java:53)
at org.anjocaido.groupmanager.GMConfiguration.load(GMConfiguration.java:63)
at org.anjocaido.groupmanager.GMConfiguration.<init>(GMConfiguration.java:49)
at org.anjocaido.groupmanager.GroupManager.prepareConfig(GroupManager.java:318)
at org.anjocaido.groupmanager.GroupManager.onEnable(GroupManager.java:155)
... 12 more