<@U0AJS60G1> I Run it on Android Studio 2.2. I ju...
# koans
a
@roman.belov I Run it on Android Studio 2.2. I just cloned it didnt install any plugin. The error is (10 more like this):
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Error:(8, 47) java: cannot find symbol
  symbol:   class Client
  location: class i_introduction._7_Nullable_Types.JavaCode7