Hi all, I'm using the REST APIs to generate the refresh-token (which I'm getting back successfully).  However, with the access token obtained in the response, no other all are going through.  I'm constantly getting the same error message as below.  I don't have any pre-request script.  What may I be doing wrong, as I am correctly copying over the access code into the Authorization code for the new call.  Please advice. 

Error message: "There was an error in evaluating the Pre-request Script:  undefined: access-token is empty or expired"