I believe that when you create a NetBeans projects from existing sources, NetBeans uses the same directory to add it's own files: some 'netbeans' folder with . Proj files.
I believe that when you create a NetBeans projects from existing sources, NetBeans uses the same directory to add it's own files: some 'netbeans' folder with . Proj files. So try to copy the entire folder somewhere else, then remove netbeans-specific files.It might work.
Thank you! I was having the same problem: Sources directory is already NetBeans project (maybe only in memory). Netbeans creates a folder in your project named "nbproject".
Once you delete that, restart the IDE and you're good to go.
This happens(i believe) because netbeans tries to version control the files created or edited. Under the project folder netbeans create a netbeans directory just delete it . This has been tested in Ubuntu.
Then you can import your project if php then php using existing sources.
Click File >> Recent Projects > and you should be able to use edit it again. Hope it helps :).
Usually this happened when we copy source code of a already created project and copied in different folder and try to create a project from it. As netBeans create its folder nbproject in our project folder this folder also get copied with our source code and it give error "Sources directory is already NetBeans project (maybe only in memory)" remove this folder from you newly copied folder and voila you can create a new project.
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