Netbean 7.1.1 problem

1). When create a project finding the Netbean will create a folder (nbproject)
2). make sure to remove when you remove a project from your Netbeans workspace (using the IDE), Netbeans allow you to remove the project without delete the sources. So, when it's done, you must delete the "nbproject" directory that was created inside your source project.

otherwise will get error when try to create new project (from existing source) in the same diretory, Netbean will show this error : 
"Sources directory is already Netbeans project (maybe only in memory)"

so make sure to delete folder "nbproject" in your application diretory.