Kaltura_Client_Exception thrown

Invalid KS "Y2MyNjJjMmNkNzAyZGE5MTY2YzMzZmQxNjVkYTQ2MjBhYmRlNjcwMXwxMDE7OzE0OTA4MzI0MzA7MjsxNDkwNzQ2MDMwLjA0NDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"