Kaltura_Client_Exception thrown

Invalid KS "Yzk4ZGU2Y2ViNTAzMmFhZjE0NzE5MDdhMGJmNTM5ZGU2NzVjMWFlMHwxMDE7OzE0ODUwMzAwOTc7MjsxNDg0OTQzNjk3Ljg4MTtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"