I tried deleting the lang file for the plugin and im getting the same error:
Failed to call hook 'CmdNextGenPVEGUI' on plugin 'NextGenPVE v1.4.9' (IndexOutOfRangeException: Index was outside the bounds of the array.)
at Oxide.Plugins.NextGenPVE.CmdNextGenPVEGUI (Oxide.Core.Libraries.Covalence.IPlayer iplayer, System.String command, System.String[] args) [0x02731] in <e482291b28b34c37b71e74d2ad1ee48d>:0
at Oxide.Plugins.NextGenPVE.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x01b32] in <e482291b28b34c37b71e74d2ad1ee48d>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <23ba99f131254889867c71f0bd137b1d>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <157a94ee66ab4a7991faecd1eb84be3b>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <157a94ee66ab4a7991faecd1eb84be3b>:0