First point of Important Special Instructions in Use Red Hat JBoss Developer Studio or Eclipse to Run the Quickstarts reads the following

1. Your quickstart project folder must be located outside of your ID workspace. If your quickstart project folder is located within the IDE workspace when you import it into Red Hat JBoss Developer Studio, the IDE generates an invalid project name and an invalid WAR archive name. Be sure your quickstart project folder is located outside the IDE workspace before you begin!

The first sentence should rather be the following

Your quickstart project folder must be located outside of your IDE workspace.