My domain doesn't work

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The error you were having can be easily solved by reading this article and especially using all the general tips on your website as well:

Common MySQL Connection Errors

Many websites use MySQL databases to store information and settings. However, there are some reasons why the connection to the database may fail. This article describes some commonly seen error messages when connecting to a database, as well as some general tips to keep in mind when setting up a database connection. Common Error Messages Using MySQL is great, but the error message returned if there is an issue logging in to your database can be quite confusing. Here are some commonly seen error…

If you don’t have a database on your hosting account, this article can help you create one:

How to setup a new MySQL Database

Many scripts require a MySQL database to work, and you will need to create a new database to use with your script. This article describes how to create a database and get the necessary settings for your script. Create a new database Before you can use a database, you need to create it first. Login to your client area and go to the Accounts list. Find your hosting account in the list and click Manage. Click the Control Panel button in the account overview page. Go to MySQL Databases. In the fi…

Then after you configured it, you might need to import a database backup for the website to work fine with the database you created:

How to import a MySQL database backup

If you’re moving your website from an existing hosting provider, or it simply doesn’t have an installation wizard, you may wish to import a MySQL dump file. To use a database backup, you first need to create a new database and configure your script to use it. Then, to import the database: Login to the control panel. Go to phpMyAdmin. Find the new database in the list and click Connect Now. Click Import in the top bar. Select the database backup file to import and click Go. Uploading large ba…