Sources directory is already NetBeans project error

i got that error and i can't add project in netbeans.. please teach me how to fix this

even if i ren开发者_如何学JAVAame my folder it doesn't work...

Netbeans tries to add a folder (nbproject) to your project during import. If it is already there NB fails to add it. Move the existing nbproject folder to a different directory outside your project and try to import again.

See this question.

Delete the nbproject folder in your project directory and restart the IDE.

I had a PHP project with maven pom.xml, with no nbproject directory and clear cache, and netbeans would refuse to create a new project from sources with that pom.xml in place. Had to remove pom.xml, create a project and put pom.xml back.

I fixed the problem with:

rm -r ~/.cache/netbeans
rm ~/.netbeans/.superId

Instead of creating it as a New Project try Open Project if nbproject directory exists in your project root directory.

This happen to me on MS Windows as well. Cause was netbeans.conf's

netbeans_default_options="-J-Dline.separator=LF"