Server/Plugin Help

Hello

I am attempting to run commands through the Enjin Donation plugin, but I'm receiving an error that I don't understand. The commands are set up properly in the plugin, to write {name} where there should be a username.

Code:

Code:

12.07 05:51:29 [Server] INFO ... 10 more
12.07 05:51:29 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at org.anjocaido.groupmanager.GroupManager.onCommand(GroupManager.java:778) ~[?:?]
12.07 05:51:29 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.CraftServer.getPlayer(CraftServer.java:487) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at org.apache.commons.lang.Validate.notNull(Validate.java:203) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO Caused by: java.lang.IllegalArgumentException: Name cannot be null
12.07 05:51:29 [Server] INFO at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:600) [Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java:53) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at com.enjin.officialplugin.threaded.CommandExecuter.run(CommandExecuter.java:30) ~[?:?]
12.07 05:51:29 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[Bukkit_Beta.1.7.9.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
12.07 05:51:29 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'manuaddp' in plugin GroupManager v2.1.19 (Phoenix)
12.07 05:51:29 [Server] WARN Task #97 for EnjinMinecraftPlugin v2.6.5-bukkit generated an exception

Here it is through pastebin too: http://pastebin.com/TWySVFU7

The first command (which is an Essentials Broadcast) runs perfectly fine with the players username, until it hits the GroupManager command. Any help would be appreciated.

Thanks,