Kaltura_Client_Exception thrown

Invalid KS "Yjc2NzY3M2NkODYwMTliOTE3ZGQ3YzI0OTcwYjc4MTY0NDFlZTBlMHwxMDE7OzE0OTM1MTA1NzA7MjsxNDkzNDI0MTcwLjc2MDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"