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I wrote a QObject subclass because I need use the property system. The class worked fine, then I wrote other code (UI code) when I try to compile this I get two errors, one in each constructor of the class: vtable not found for <classname>. Reversing the changes the problem dosn't fix. Any suggestion?
This must be the most classic problem in Qt. As reversing the changes doesn't fix it, clearly part of the problem is in the build system. Do a clean for the project and a rebuild and then try again and see where you get the problems. With a little googling you will get other ideas. If I remember correctly, sometimes the problem has been caused by multiple inclusion of a file in the project or/and multiple inclusion of a header file. You might want to look carefully at your build process log and not just the main resulting "issues". The last time I had this problems the hint was an unnecessary recompiling of a file, which made me look into the .pro file for duplicate entries for source files and any duplicate headers issues.