Error in Unity Package Manager

Hello,

I copied ML-Agents-Master on C:\ and now I want add ML-Agents plugin in my unity through Unity Package Manager. When I do it I get a error message !
how can I solve it ?

error message is :

Package com.unity.ml-agents@file:C:\ml-agents-master\com.unity.ml-agents has invalid dependencies:
com.unity.barracuda: Package [com.unity.barracuda@0.6.1-preview] cannot be found [NotFound]
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()```

There is not anybody that help me ?! :frowning: