[Qt Creator] error debugging when running application in terminal: "Failed to start application: Couldn't get registers: No such process."

[arounder8]

I'm trying to debug a program that uses console input. I have to debug such a program in terminal because Qt Creator application window freezes when it runs against std::cin() statement. On tools -> options -> environment -> system -> terminal I have value: xfce4-terminal -x. Program runs properly in terminal when I just run it without debugging.

Debugger log is "here":http://pastebin.com/2Lt4wJmb

Running Qt Creator 2.6.2 (based on Qt 5.0.1 64bit) which I built from sources.
My linux kernel version is: 2.6.32-5-amd64
My linux is based on Debian Squeeze (with lots of testing packages installed)
I'm running xfce 4.8.0.3 as desktop environment.
I got the same error when I was running default gnome2 desktop environment as well.

Any idea what is causing this error?