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

I have a slightly different situation whereby my eclipse stops responding and I have had to kill the session. After restarting Juno, then the particular project I was working on disappeared although .project file exists. Trying to import back into Eclipse would yield the same "Some projects cannot be imported .." or "A project with this name already exists" if trying to create a new project.

In the end, since I was using Working Sets, I managed to find this file .metadata.plugins\org.eclipse.ui.workbench\workingsets.xml. Manually added the missing entry and restarted eclipse and voila, it came back.