Well... this time I could add the game and generate the API key.
But while trying to post a message at player's facebook wall I am getting the following error:
Javascript error!
TypeError: Clay.Facebook is undefined
http://localhost:50002/Clay_plugin.js, line 891 (col undefined)
This is either a bug in Construct 2 or a problem in a third party plugin or behavior - please report it to the developer!