<Android Studio Login Token Request Error using Re...

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Android Studio Login Token Request Error using Retrofit and SharedPreferences
A token is sent to the client when I login, so I'm going to use the retrofit library to take the token and include it in the header of the request and send the data to the server.
When I login, I want to save data through the SharedPreferences library to store tokens delivered to the client locally.
But there is error :
FATAL EXCEPTION: main
Process: com.example.todo_android, PID: 7323...