still have this issue

ailed to call hook 'furnace_ui' on plugin 'FurnaceLevels v1.4.1' (NullReferenceException: Object reference not set to an instance of an object)
  at Oxide.Plugins.FurnaceLevels.GetNextPrice (System.Int32 index, System.String modType) [0x000c5] in <c46f79f3b2b84e399a231f66cde6844a>:0 
  at Oxide.Plugins.FurnaceLevels.CreateCui (BasePlayer player, System.UInt64 ovenId, System.String prefabName) [0x000bc] in <c46f79f3b2b84e399a231f66cde6844a>:0 
  at Oxide.Plugins.FurnaceLevels.furnace_ui (ConsoleSystem+Arg arg) [0x000a9] in <c46f79f3b2b84e399a231f66cde6844a>:0 
  at Oxide.Plugins.FurnaceLevels.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x009e0] in <c46f79f3b2b84e399a231f66cde6844a>:0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <09575a60985045248bcb43b20faeeb99>:0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in <bae5f1223fce49c493b01571c99dce02>:0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <bae5f1223fce49c493b01571c99dce02>:0 
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
NullReferenceException: Object reference not set to an instance of an object
o.reload FurnaceLevels

Delete old config when updating to 1.4.1 version

Changed Status from Pending to Not a Bug