Kaltura_Client_Exception thrown

Invalid KS "NDVmZDVhMDFkZjY2OGMwMDNiMDcxMmE2NDdkNzA0ODJlOGRjNGJlNHwxMDE7OzE0NzUzNjE5ODg7MjsxNDc1Mjc1NTg4LjQzNjQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"