Kaltura_Client_Exception thrown

Invalid KS "Mzk4OTY2MmU2MzYxMjgwMGJjYTJlNmMzMTQwNjVhNjYzYTllNzc0OHwxMDE7OzE0OTMyMTg4Njk7MjsxNDkzMTMyNDY5Ljg4NztBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"