Qt 6.12 LTS is out! See what's new in the release
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What is my next step ?
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After successfully completing changing subproject to library and adding it to my main project - I get this error

I have seen this before - not finding the library - but it usually "goes away" after another "build".
Not this time - no build / rebuild /clear helps - still same error.The path is definitely wrong - but how did it get build that way ?