Three installation problems.

Dear friends,

I am totally new to Modx Revolution but I want to try its features. I have tried with Drupal but I want to see if Modx better corresponds to the website I want to build.
When I try installing Modx Revolution, I end up having the three following problems.

Warning: PDOStatement::execute() [pdostatement.execute]: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected in C:\xampp\htdocs\modx\core\xpdo\om\xpdoobject.class.php on line 236

Warning: PDOStatement::execute() [pdostatement.execute]: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected in C:\xampp\htdocs\modx\core\xpdo\om\xpdoobject.class.php on line 1277

Warning: PDO::exec() [pdo.exec]: SQLSTATE[3D000]: Invalid catalog name: 1046 No database selected in C:\xampp\htdocs\modx\core\xpdo\xpdo.class.php on line 1793

As you can see, the name of the directory in which I installed Modx Revolution on the server is "modx".
Are the problems arising because of a Drupal installation on the same server (Apache with Xampp)?

Thank you for your help.

Sam.

Hi. We’ll need this before we can help you:

Note: If you’re posting about a bug, please state all of your Environment information in your post: Version of MODx, Traditional or Advanced distribution (for Revo), Server OS, Server Version, PHP Version, MySQL Version (client and server), is pdo_mysql installed, your Browser type and version, if you are using any opcode caching such as eAccelerator, APC, winCache, xCache, etc; any relevant errors in core/cache/logs/error.log, and any other environment data we should know. We can’t help you without that information.