Actually, after reinstalling, I'm not getting an error message when I debug the project

'New Debug session with 'wwwmywebserver' server has started. But IDE could not find the project for the web debugging'. Breakpoints and other features may fail to work.

Any idea what this refers to? What project isn't found?

I've tried recreating the project but it comes up with the same error

Probably you have wrong Run Mode or root URL in the project properties. Check them with Project Settings Wizard.