Kaltura_Client_Exception thrown

Invalid KS "ZGUwZTg3NGY0OGJhMWVlOThlNGIyNjYxOWQyNDMyNjYxY2UwYjI1N3wxMDE7OzE0ODE0NDc0ODU7MjsxNDgxMzYxMDg1LjE3NjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"