QT 6.5 /VStudio - Error compiling release/debug : cannot open input file qtmain.lib OR qt.natvis.xml - cannot be evaluated

[elicat]

Hello, I installed the new QT 6.5 version on a project based on the QT 5.15 version.
After aligning some parts of the code by compiling in Release , I only get one error code

cannot open input file 'qtmain.lib'	

If I compile in Debug I find this

Error	MSB4184	The expression "[System.IO.File]::ReadAllText(C:\Users\gianfranco.facchini\AppData\Local\QtMsBuild\qt.natvis.xml)" cannot be evaluated. Could not find file 

I can't figure out what's missing, all references for QT libraries are set as variable, not fixed.
Can someone help me ?

Thanks in advance