This isn't an error, it's the debugger telling you that you've tried to step into a method for which it cannot locate the source code. You may have to edit your debugger setttings to make sure you include all the directories where your source code is located. If you are using Visual Studio, this is under the Tools -> Options command; when the dialog appears, go to Projects and Solutions -> VC++ Directories, and add the source paths to Qt in the Source Files options.
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