title: Android Studio 3.0 Canary 1 GRPC error
body: <p>After I upgraded to Android Studio 3.0 Canary 1, the logcat tab in the Android Studio don't work properly. It continuously output the following error log. I don't know what's wrong.</p>
  
  <blockquote>
    <p>05-19 18:05:18.676 10029-10072/com.example.chansoncc.bodypractice E/GRPC: tcp_client_posix.c:176] failed to connect to 'ipv4:127.0.0.1:12389': socket error: connection refused</p>
  </blockquote>
  
  <p>Can anyone help?</p>