Kaltura_Client_Exception thrown

Invalid KS "Y2UxNzVlMjM0ZDNlY2ExNjRmNjA4ZDUyY2JkMDc0NDVmZmIzNWJiMHwxMDE7OzE0ODgwMTI0NzU7MjsxNDg3OTI2MDc1LjU1NjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"