An item with the same key has already been added. Key: UnityEditor.Scripting.ScriptCompilation报错

1、unity3D导入新的插件会出现以下报错：
ArgumentException: An item with the same key has already been added. Key: UnityEditor.Scripting.ScriptCompilation.ScriptAssembly System.Collections.Generic.Dictionary`2[TKey,TValue].TryInsert (TKey key, TValue value, System.Collections.Generic.InsertionBehavior behavior) (at <437ba245d8404784b9fbab9b439ac908>:0)
2、直接关闭工程从新打开即可。