Force wipe error

Skinner is working aside from the skincraft menu not loading. This error is produced when users are opening the skincraft menu:

 

Failed to call hook 'DefaultSkinsCMD' on plugin 'Skinner v2.1.9' (NullReferenceException: Object reference not set to an instance of an object.)

at Oxide.Plugins.Skinner+BoxController.GetItemFromPool (System.UInt64 cachedSkin, ItemDefinition itemDef, System.Int32 pos) [0x00087] in <d7227d2a1efa4da7a360852244a60307>:0

at Oxide.Plugins.Skinner+BoxController.InsertItem (System.UInt64 cachedSkin, ItemDefinition itemDef, System.Int32 amount, System.Int32 pos) [0x00000] in <d7227d2a1efa4da7a360852244a60307>:0

at Oxide.Plugins.Skinner+BoxController.GetDefaultSkins () [0x00170] in <d7227d2a1efa4da7a360852244a60307>:0

at Oxide.Plugins.Skinner+BoxController.SkinCraft () [0x000c0] in <d7227d2a1efa4da7a360852244a60307>:0

at Oxide.Plugins.Skinner.DefaultSkinsCMD (Oxide.Core.Libraries.Covalence.IPlayer iplayer, System.String command, System.String[] args) [0x00265] in <d7227d2a1efa4da7a360852244a60307>:0

at Oxide.Plugins.Skinner.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x00f29] in <d7227d2a1efa4da7a360852244a60307>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <42f9bedc659b4f4786eb778d3cd58968>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <d59b507fd76240e5b62228d0eae39b73>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d59b507fd76240e5b62228d0eae39b73>:0