Error Message:

Failed to call hook 'OnResearchCostDetermine' on plugin 'EasyResearch v2.1.3' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.EasyResearch.OnResearchCostDetermine (Item item, ResearchTable researchTable) [0x00022] in <6c918436d4b54d76ae009f138c25e711>:0 
  at Oxide.Plugins.EasyResearch.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x0053e] in <6c918436d4b54d76ae009f138c25e711>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <87ce9ac9776a48658bc55eae6debe38b>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <18d4f19bbc844191b11ed9e69284d09b>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <18d4f19bbc844191b11ed9e69284d09b>:0 ​