Debugging error of a simple program

[Professor widget]

Hello Qt guys...
As a new member to this forum and a Qt newbie - no wonder I come across a few errors from time to time. When I tried to open a new widget project - it compiled and debugged properly. When I got into main.cpp of the widget and changed the code ( just anything ) it wouldn't debug and is giving me this error instead:

:: error: cannot open output file debug\HelloWorld.exe: Permission denied
:: error: collect2: ld returned 1 exit status

What is the reason behind it ? Thank you for any comments.

P.S. My Qt paths seem to be correct I guess. No problems with them..

[ars]

Is your Hello.exe still running? I usually get this type of error when I forgot to close my program before recompiling it.

[Professor widget]

Thanks - that was the reason. Of course ( have just noticed ) you can close the process straight from the Qt output menu.

[stampede]

See if you can delete your HelloWorld.exe manually. If not, then you can be sure that an instance of your program still runs

[squidge]

Can you delete the output file (.exe) ?

[Professor widget]

Indeed guys...the reason was as 'ars' pointed out - that closing a process is a must on Win ( whether in task bar or Qt output menu ) I've just noticed the process closing options in Qt.

Seems to be working for the time being. Thx to all..