You may have incurred in a similar message:

This may happen because you downloaded the “recommended version” of Fx Artifacts.

To fix this you simply need to use the latest artifact available instead like this:

You may have incurred in a similar message:

This error may be caused by a wrong mySQL string in your server.cfg file and/or your connection to the database is not working.

The following steps may help you solve the problem:

• Check if your MySQL String in your server.cfg file is correct and correctly formatted: check OxMySQL documentation for more instructions.
• Check if your database connection is working, use the Install guide to make sure your database is up and running

You may have received a similar message:

if you receive this error, update your es_extended to the latest version.