No valid Qt version set?

**RoryWalsh** · 8th October 2009, 14:07

I've been trying to get qtcreator working for me for a while now. After doing a fresh uninstall and reinstall this morning I was able to at least get qtcreator to call the compiler. As I had to leave my pc I closed qtcreator. When I returned and opened it again I get 'No valid Qt version set' even though the paths are valid. I was getting this error before and reinstalling worked, but only for one session, not I get this same error again. I've looked over the archives but couldn't find anything concrete, just a whole lot of stabs in the dark. Another strange thing is that the first time I launched after reinstalling I was able to set my mingw directory in tools/options. After starting qt for the second time I no longer have the option to set my mingw dir? Any help is much appreciated.

**squidge** · 9th October 2009, 18:12

After the error message, what does Tools/Options/QT4/QTVersions say?

**big4mil** · 17th October 2009, 08:16

Hi All,

I have exactly the same problem with QT Creator. I have donwloaded the "Download Qt SDK for Windows* (178Mb)" and installed it on Windows 7 (RC1). So, if I open now my Qt Project in QT Creator and try to compile I get the following message:

Qt Code:

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No valid Qt version set. Set one in Tools/Options 
Error while building project MovMan
When executing build step 'QMake'
Canceled build.

No valid Qt version set. Set one in Tools/Options 
Error while building project MovMan
When executing build step 'QMake'
Canceled build.

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In Tools/Options it says the I have first to run make install. But Im quite new to QT on Windows. Can anyone help?

Many thanks
big4mil

**squidge** · 17th October 2009, 10:56

I've had this problem, but only when recompiling the lib and then changing the directory name. Try setting the environment variable QTDIR or a qt.conf file:

[Paths]
Prefix = "c:\\Qt\\2009.04\\qt\\"

and dropping it in the qt\bin directory.

**big4mil** · 21st October 2009, 08:02

Thanks for your reply...

I have installed the VC++ 2008 Express Edition. Then I downloaded and compiled the qt source - and now Qt Creator is working as accepted.

best regards
big4mil