Kaltura_Client_Exception thrown

Invalid KS "MGRhYjk2MGFiYTBhNGZmYmJlMTA4OWIxMWY2ZDM3ZTY3ZTg5NjRhYXwxMDE7OzE0ODE0NDc1NzI7MjsxNDgxMzYxMTcyLjUzMDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"