Kaltura_Client_Exception thrown

Invalid KS "N2E3NDM2MTczZDA2NDIyYTRlZmUwOGQxZjM5MjIyMWZmZjBjZDZiN3wxMDE7OzE1MDA3MjkwNTQ7MjsxNTAwNjQyNjU0LjYxNTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"