Sorry you are having difficulty integrating the plugin. Please turn on logging and show the output so I can assist — the instructions are known to work so there must be a minor implementation issue which the OpenEars logging may assist with. Here is a link to how to turn logging on: https://www.politepix.com/openears/yourapp/#logging
Can you elaborate on what the difference is between your correction and the original instructions? They look like they are the same to me but maybe I am overlooking something.
Just checking since I recall you are using an earlier version of OpenEars, did you follow the instructions to update to OpenEars 1.1 before adding RapidEars?