The software has crashed. Activate the debug mode for more information. Very likely an extension is not working properly or is not up to date. As soon as the relevant extension has been updated, the problem should be resolved. Contact the webmaster if this error message is displayed continuously.

Install the current PHP version on your web server. You need PHP 7.0 or higher. On Linux it's best to use the package management of your Linux distribution, for Mac there is MAMP, for Windows there is XAMPP. It's recommended to use the latest PHP version. As soon as the website finds the required PHP version, the problem should be resolved.

Install the missing PHP extension on your web server. You need curl gd mbstring zip. Please keep in mind that the web server and the command line may use different PHP versions. It's recommended to use the same PHP version. As soon as the website finds the required PHP extensions, the problem should be resolved.

Copy again all of the supplied files into the installation folder. Check if your FTP application shows an error message during upload. It sometimes happens that the data transfer was interrupted during upload. After all files have been copied into the installation folder, the problem should be resolved.

Check the configuration of your web server. The web server requires additional URL rewrite rules, but this depends very much on the web server and operating system you use. It's best to contact your web hosting provider. As soon as the web server forwards HTTP requests to the yellow.php, the problem should be resolved.

Execute the command chmod -R a+rw * in the installation folder. You can also use your FTP application to give write permissions to all files. It's recommended to give write permissions to all files and folders in the installation folder. As soon as the website has sufficient write access in the system folder, the problem should be resolved.

The file can not be written to the file system. Execute the command chmod -R a+rw * in the installation folder. You can also use your FTP application to give write permissions to all files. Sometimes a file syncing application is miss-configured. Contact the webmaster if you keep having problems with the file system.

The file can not be downloaded. This error message usually means that there is no internet connection or that outgoing HTTP requests to certain websites are being blocked. Sometimes it is enough to simply try again later. Contact the webmaster if this error message is displayed continuously.

The email message can not be sent. You may have to configure the email address for outgoing messages, so that the email address contains your domain name. Sometimes the default email address doesn't work or the mail server is miss-configured. Contact the webmaster if this error message is displayed continuously.

The page in question is not supported in a static website. There are some technical limitations to what the static generator can do, for example the static generator can't generate an email contact form. Any page could theoretically be generated as a static page, but then you would need additional services to handle dynamic HTTP requests.