Kaltura_Client_Exception thrown

Invalid KS "YWRhNmJhNmRlZTQ4ZGZmNjMyOTk5ZGIyNDcxNWM0ZDE5NzFiYjhhMXwxMDE7OzE0OTg1ODY0MzA7MjsxNDk4NTAwMDMwLjgzNTtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"