[Qt-creator] Could not run my app. "Command not found"

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>> I run the 0.9.2 version on Linux
>>
>> Built on Feb 5 2009 at 19:27:27
>> >From revision 4ef83082f6
>>
>> and just got this message after pressing: CTRL+R
>>
>> a console window with the text:
>>
>> /bin/sh: : command not found
>> Press enter to close this window
>>
>> I started QtCreator  from another directory than the one where the
>> application is.
>> The app is created and I can run it  with ./myapp
>> . is not in my $PATH
>>
>> Any ideas on what can be wrong?

> Delete the .pro.user and try again.

What does the pro.user file do?