Opening existing projects

I am having a bit of a strange time opening existing old projects.

When I add the old folder it gives no error, but when i switch to that project I am getting a big red error saying.

If I switch to the Database Manager tab and click an existing connection I get this

Screenshot 2021-02-15 at 09.48.26404×1095 39.4 KB

The two it is giving an error on are the two different Server Connect connections.

Before I start breaking things, i figured it may be best to check what I should do.