Remove Auth click gets an error response

[waliurjs]

Respose (in short):
{error_code: "12", error_msg: "REST API is deprecated for versions v2.1 and higher (12)"}
Chrome HAR file and HAR Viewer

Extras:
I'm running the app locally using gulp prepare-testapp
The FB App is a 'test app' created today.
Successfully logging in and also api call to "/me" receives data.
Just remove auth button receiving error.