Kaltura_Client_Exception thrown

Invalid KS "YzVlZjE0Mjk4ZWRiNGEyNzEzN2RhODY4ZTEyOTFkNWQwNjNjODc4MHwxMDE7OzE0NzUyOTIzMTM7MjsxNDc1MjA1OTEzLjYwNDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"