Articles empties Package Management page

I'm using Revo 2.2.4

I've installed Articles without a single problem. I've even created an Article and it shows up without a problem.

However, when I go to my Package Management page, none of the Packages that I've already installed show up where they're supposed to.

On top of that, when I click on Download Extras, I get this a blank page, then an error (see attachment).

What do I need to do to fix that?

Thank you.