The configuration file {/var/www/html/config/config.ini.php} has not been found or could not be read.

The Piwik configuration file couldn't be found and you are trying to access a Piwik page.
ยป You may install Piwik now
If you installed Piwik before and have some tables in your DB, don't worry, you can reuse the same tables and keep your existing data!