paypal transcation issues

[zee000]

Hello guys,

             I am using paypal for transactions in my site. after the transaction is done by the user i am getting this error message to my admin email

A fatal error occured while processing a paypal transaction.
       ----------------------------------
       Hostname: www.example.com
       URI: /testing/ipntest.php
       php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution (0)
       Status: FAILED


             I don`t know why i am getting this error message i have done every thing perfectly. please can any one suggest me how this error occurs and how to solve this issue.