Visual Studio Code SQL Server (mssql) Extension – Error

In Visual Studio Code (Version 1.102.3) I have installed the extension SQL Server (mssql), but I am unable to use it. I am getting this error: There is no data provider registered that can provide view data.

Clicking on the add connection button does nothing. This is the output:

I have tried uninstalling and installing the extension a few times, but the same error happens. I have auto update on. It’s completely unusable, as I can’t connect to any database or run any queries.