504 Gateway Time-out

[booking]

After I pressed start for about 1 minute, it appeared to be 504 Gateway Time-out (as attached file). What should l do?

[XML-Sitemaps Support]

Hello,

it looks like your server configuration doesn't allow to run the script long enough to create full sitemap. Please try to increase memory_limit and max_execution_time settings in php configuration at your host (php.ini file) or contact hosting support regarding this.