@mrjj thank you :)

@Dhani - thanks from me too. This fixed the same problem I was having connecting to a virtual serial port on an NXP dev board.

Thanks !

Hi, Can you show your .pro file ?

Qt Designer is included in Qt sources and works only for UI files. Qt Creator (the IDE) is a separate application and a separate project. You need to install or compile it first, for example from qt.io/downloads. Once you have Qt Creator installer, you need to open the settings, add your Qt Version, then add a so called Kit (which is Qt Version + compiler bundle), and then you are ready to go. If you want to avoid all that hassle, use the Qt installer from the link above - it will install Qt, Qt Creator, and set everything up for you, completely automatically.

@SGaist you save me , thanks man

@LuAria please don't forget to mark your post as solved when your problem is finally gone :-)

@jsulm woooow! i add the spaces and the error disappear! REALLY REALLY thanks!!!!

@LeLev Thanks , I will try the same .