Kaltura_Client_Exception thrown

Invalid KS "M2Y0NzlkM2M0NGVhMGRhN2MxN2IyNmZlMzNjNzM3OGQ4OTQwZjA5NXwxMDE7OzE0NzUyMzg2Mzk7MjsxNDc1MTUyMjM5LjMxNDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"