Sources folder is already NetBeans project (maybe only in memory).

For detailed tutorial and screenshots visit - https://goo.gl/rB3Vj8

If you see this error "Sources folder is already NetBeans project (maybe only in memory)." when importing Netbean Project Follow these steps :

1. Go to the folder containing your project.
2. Delete the folder named nbproject.
3. Restart Netbeans.
4. Try creating or opening your project again from the original folder.
5. And Voila!! , You're good to go.