Qt Creator: “XYZ does not name a type”

Question

This is a very frustrating error message in Qt Creator: ’XYZ’ does not name a type. This usually means that there is an error in the class XYZ that prevents the compiler from generating the type, but there are no additional hints as to what went wrong.

Any suggestions?

Answer 1

I found this problem on qtcreator 3.4.1 and QT 5.4, when I replace such as

#include <QTextEdit>

with

class QTextEdit;

this problem gone.