Some projects cannot be imported because they already exist in the workspace error in Eclipse

Question

I am trying to import a project that me and my co-worker have been working on.. and keep getting this error after I select-- \"import\" then \"import existing project\" then

Answer 1

Check if you have configured Eclipse to show ALL the working set. I once encountered exactly the same problem and it turned out I accidentally imported the project into the Other Projects working set. And my Eclipse configuration didn't show that working set in the package explorer, which lead me to believe that the project was not imported yet.

Updated for @Mawg:

First, click the Select Working Set...:

Then, choose No Working Sets:

This will effectively disable the working set and show all projects.