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If you ever see this when you go to your Geo installation the Geo software cannot connect to the database currently setup within the config.php. If you haven't configured the config.php to connect to a database this isn't a problem. Set up the config.php file with the information needed to connect to the database you created for the software to use and this message will disappear.
If you have setup your site and it is in use this error means that either the connection your server has to the database is down (if the MySQL server your site uses is actually on another server) or the database itself is down. Either way there is a problem in the hosting environment and contact your host with concerns about the issue. Our software doesn't manage the MySQL server and so can't cause or fix this issue if it appears.
If your site has been in operation this could be a big problem. Treat this as a serious problem that you need to fix as soon as you can. The "state" of your software is kept within the database. The database contains all information about your users, their listings and all configurations for operation of your software on your site. These are the following possibilities to check when you see this message: