Critical Error during the update process:

Database 374193_piwiki is empty. You must edit or remove your Piwik configuration file.

The above is the core error message. It should help explain the cause, but if you require further help please:

• Check the Piwik FAQ which explains most common errors during update.
• Ask your system administrator - they may be able to help you with the error which is most likely related to your server or MySQL setup.