[QDevelop] Problem with empty project

I'm having some problem dealing with the creation of *.cpp or *.h files into an empty project with qdevelop(The latest binary version for linux).
When i create the project i'm not able to add any of this files....because an error appears....[Not possible create the file]!
What do you think??? thx.

Ps. I have the right permissions on my working directory.

What is the directory permissions? Is it 770?

I resolve the problem giving also the writing access to all kind of user with the command:
chmod -R a+w qdevelop