Thread:Project:Support desk/Internal error MediaWiki 1.20 - PHP

I updated MW version 1.13.2 to 1.20.3. Before, I updated PHP from 5.2.17 to 5.4 on the server. The installation went well. In the Webinstallation it recognized PHP 5.4 when it checked the System-Requirements and said it's ok to install the new version. After the installation, when I cklicked on the button "you can use MediaWiki now" I got following message:

MediaWiki 1.20 internal error MediaWiki 1.20 requires at least PHP version 5.3.2, you are using PHP 5.2.17. etc.