Kaltura_Client_Exception thrown

Invalid KS "M2E2ZDI5MTg5NGI4MTM1OTM5ZmJkYWM0YjdkMTQwMTU3ODIwNzg2NXwxMDE7OzE0NzUxOTQ3MjA7MjsxNDc1MTA4MzIwLjg4MzU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"