Kaltura_Client_Exception thrown

Invalid KS "MzE1Y2IxZjU3ZThmNjkyNzQ1YzVkNTA4NDU5N2E4ODg3OTNjYzhhYnwxMDE7OzE0OTU3MDA0MDM7MjsxNDk1NjE0MDAzLjA4ODY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"