エラー： 'testphp.vulnweb.com'ホストがsqlmap kali linuxに存在しませんか？

私はubuntu 14.04 ltsのvirtualboxでkali linuxを実行しています。root@kali:~# sqlmap -u http://testphp.vulnweb.com/listproducts.php?cat=1 --dbssqlmapで実行中に次のエラーが発生します。助けてください。

root@kali:~# sqlmap -u http://testphp.vulnweb.com/listproducts.php?cat=1 --dbs
         _
 ___ ___| |_____ ___ ___  {1.0-dev-nongit-20150914}
|_ -| . | |     | .'| . |
|___|_  |_|_|_|_|__,|  _|
      |_|           |_|   http://sqlmap.org

[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program

[*] starting at 23:19:09

[23:19:11] [WARNING] using '/root/.sqlmap/output' as the output directory
[23:19:11] [CRITICAL] host 'testphp.vulnweb.com' does not exist

[*] shutting down at 23:19:11