CAUTION: SLIPPERY FLOORThe Arduino Library Manager installs the ArduinoJson version 6 by default.
However, using version 5 is highly recommended because version 6 is still in beta stage.
Open the Arduino Library Manager and make sure that ArduinoJson version 5 is installed.
For some reason, it’s not possible to use ArduinoJson with CodeBender.
See discussion here: http://feedback.codebender.cc/forums/280538-library-requests/suggestions/7238254-arduinojson-support