It is what the error message says. You need to install a PHP MySQL extension, likely mysqli. If you're on Linux that probably is in it's own package, e.g. something like php_mysqli or php7_mysqli.
If you're on Windows it might mean editing php.ini to enable an extension.
The tracker is not meant for support, so please move any further discussion to the forum.
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#3683 - Error "There are no PHP extensions loaded for database handling"
If you're on Windows it might mean editing php.ini to enable an extension.
The tracker is not meant for support, so please move any further discussion to the forum.