no errors its just nolonger visible/on screen im guesing due to UI Changes

Working for me. I'm not aware of any changes in the recent Rust update that would have affected this.

Try running the /sortbutton command to see if it comes back. Each player can toggle visibility of the button as a personal preference.

Failed to call hook 'OnLootEntity' on plugin 'SortButton v2.0.2' (InvalidCastException: Null object cannot be converted to a value type.)
  at System.Convert.ChangeType (System.Object value, System.Type conversionType, System.IFormatProvider provider) [0x00029] in :0 
  at System.Convert.ChangeType (System.Object value, System.Type conversionType) [0x0000c] in :0 
  at Oxide.Core.Plugins.Plugin.Call[T] (System.String hook, System.Object[] args) [0x00008] in :0 
  at Oxide.Plugins.SortButton.IsFriend (System.String playerId, System.String targetId) [0x00021] in :0 
  at Oxide.Plugins.SortButton.IsAlly (System.UInt64 playerId, System.UInt64 targetId) [0x0003f] in :0 
  at Oxide.Plugins.SortButton.HandleOnLootEntity (BasePlayer basePlayer, StorageContainer entity, System.Boolean delay) [0x000cc] in :0 
  at Oxide.Plugins.SortButton.OnLootEntity (BasePlayer basePlayer, StorageContainer entity) [0x00000] in :0 
  at Oxide.Plugins.SortButton.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x002f9] in :0 
  at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in :0 
  at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000d8] in :0 
  at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in :0 

i got this