Errors opening GUI after adding rewards

Getting the following error after adding rewards:
 

(23:22:49) | [Oxide] 23:22 [Error] Failed to call hook 'CmdOpenUi' on plugin 'Referrals v1.3.1' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.Referrals.MainUi (BasePlayer player, System.Int32 page, System.Int32 rPage, System.Boolean first) [0x010cb] in <30ddfd3f28ce43098c584b33a8e3e7a6>:0 
  at Oxide.Plugins.Referrals.CmdOpenUi (Oxide.Core.Libraries.Covalence.IPlayer cov, System.String command, System.String[] args) [0x00091] in <30ddfd3f28ce43098c584b33a8e3e7a6>:0 
  at Oxide.Plugins.Referrals.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0096f] in <30ddfd3f28ce43098c584b33a8e3e7a6>: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

Config is attached. I think it is because i have 2 rewards for the same amount of referrals? I was thinking this would be how to give 2 rewards

Referrals.json