請教大家個問題，最近在學socket，使用protobuf遇到的問題：
我是用的是Unity2017版本，使用的Google.Protobuf.dll支持.NET4.6及以上，然后就在在Unity中修改Scripting Runtime version為.NET4.6，再匯入Google.Protobuf.dll報錯：
The type System.IEquatable1<T>' is defined in an assembly that is not referenced. Consider adding a reference to assembly `System.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
這個該怎么解決？
uj5u.com熱心網友回復：
找到報錯的代碼所在工程，添加對System.dll的參考uj5u.com熱心網友回復：
我添加后報錯：error CS1703: An assembly `System' with the same identity has already been imported. Consider removing one of the references
Assets/Plugins/System.dll (Location of the symbol related to previous error)
System.dll (Location of the symbol related to previous error)
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