why cannot I use start debugging?

[JoyceHappy]

I installed Qt Creator. After I set up the break points, I cannot choose start debugging or F5. I've already set up the path. Debugger->GDB -> starup script.
What else should I check? Thanks a lot.

[jsulm]

@JoyceHappy Startup script? You should set the path to debugger executable.
What compiler are you using?
On which platform?
Qt version?

[JoyceHappy]

Thanks a lot ! Have a great day!
I've setup the start script for gdb/usr/bin/gdb.
I am running on Linux. Qt version is Qt Creator 2.4.1 based on Qt 4.7.4.

[SGaist]

Hi and welcome to devnet,

If possible you should update your installation. The current version of Qt Creator is 4.2.1 and 4.3 is around the corner.