MySQL server has gone away
The database server could be connected to (which means your username and password is okay) but the worldwidetravel_wpdata database could not be selected.
worldwidetravel_wpuser have permission to use the worldwidetravel_wpdata database?username_worldwidetravel_wpdata. Could that be the problem?If you do not know how to set up a database you should contact your host. If all else fails you may find help at the WordPress support forums.