Kaltura_Client_Exception thrown

Invalid KS "Y2NiZWZmNDIxNmZkYjRjNjY0NDAzMWU3MmRmMDAyNjE5MDA2OGZkNXwxMDE7OzE0NzUwMjk0NTc7MjsxNDc0OTQzMDU3LjczMDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"