warning: GDB: Failed to set controlling terminal: Operation not permitted

I get this error (title of this question), when I am attempting to debug C/C++ programs using gdb with Netbeans IDE.

Does anyone know what this means, and how to get rid of the warning?

I am able to debug despite the warning, but I'd still like to make the warning go away.

Relevant details:

1. OS: Ubuntu 9.10
2. gdb: 7.0-ubuntu
3. Netbeans: 6.8.1