I am getting this on the server all of the sudden. It has been running fine with no errors on last update.
[Error] Failed to call hook 'OnServerInitialized' on plugin 'StackSize v2.1.1' (InvalidOperationException: Operation is not valid due to the current state of the object)
at System.Linq.Enumerable.First[ItemGeneratorAsset] (IEnumerable`1 source, System.Func`2 predicate, Fallback fallback) [0x00000] in <filename unknown>:0
at System.Linq.Enumerable.First[ItemGeneratorAsset] (IEnumerable`1 source, System.Func`2 predicate) [0x00000] in <filename unknown>:0
at Oxide.Plugins.StackSize.UpdateStackSizes () [0x00000] in <filename unknown>:0
at Oxide.Plugins.StackSize.OnServerInitialized () [0x00000] in <filename unknown>:0
at Oxide.Plugins.StackSize.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00000] in <filename unknown>:0
at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00000] in <filename unknown>:0
at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x00000] in <filename unknown>:0
at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00000] in <filename unknown>:0