Kaltura_Client_Exception thrown

Invalid KS "YzE5YWJkNWRmMjEzYTA3YmJkOWU1NTQzN2IzMGUwNzM4YThlMzRmM3wxMDE7OzE0NzUwMzQ2NDQ7MjsxNDc0OTQ4MjQ0LjE1OTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"