Kaltura_Client_Exception thrown

Invalid KS "YjQxNWFjODJkMWFmYmY4MDM5MDgzY2JjOGEyMmY0MTJhOWM0ZGI0M3wxMDE7OzE0ODgwMzY0Mzk7MjsxNDg3OTUwMDM5LjA3NjU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"