Kaltura_Client_Exception thrown

Invalid KS "MzY4N2JlMTA1ZDVlNGUxOTE5ZjAxZTc3Njc2NDZkMzI2ZmEzODkyY3wxMDE7OzE0OTg0OTgwNzQ7MjsxNDk4NDExNjc0LjUyNDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"