Kaltura_Client_Exception thrown

Invalid KS "N2FhZTE4ZjYyOGUxMDEyOTY0MDkyMmRkNzk3ZTEzNjQyMjc0M2YxYXwxMDE7OzE0ODEyNzAxOTI7MjsxNDgxMTgzNzkyLjUyMTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"