I don't know where I configured it wrong

| Failed to call hook 'Unload' on plugin 'SkillTree v1.6.2' (InvalidOperationException: Collection was modified; enumeration operation may not execute.)

at System.Collections.Generic.Dictionary`2+Enumerator[TKey,TValue].MoveNext () [0x00013] in <8ce0bd04a7a04b4b9395538239d3fdd8>:0

at Oxide.Plugins.SkillTree.Unload () [0x00c37] in <e282b6f2f3174b6fa7c813daccd22a70>:0

at Oxide.Plugins.SkillTree.DirectCallHook (System.String name, System.Object& ret, System.Object[] args) [0x03765] in <e282b6f2f3174b6fa7c813daccd22a70>:0

at Oxide.Plugins.CSharpPlugin.InvokeMethod (Oxide.Core.Plugins.HookMethod method, System.Object[] args) [0x00079] in <9c80d821d00a44c9a24497c73ad2d20d>:0

at Oxide.Core.Plugins.CSPlugin.OnCallHook (System.String name, System.Object[] args) [0x000de] in <d646191a355d43a6b3ab36b7ee14c740>:0

at Oxide.Core.Plugins.Plugin.CallHook (System.String hook, System.Object[] args) [0x00060] in <d646191a355d43a6b3ab36b7ee14c740>:0

.树.json

Will need to work out where its failing.