Error printing a string

[ayanda83]

Hi there, why does the following statement give an error in Qt?

cout << r1.toString() <<endl;

cout << r1.toString() <<endl;

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I have a class named "R" and r1 is an object of class "R". toString() is a string returning member function of class "R". when I run my program I get the following error.
errorImage.jpg
I have to mention that the above does not give an error when run in pure C++. It's only when I run it in Qt that it gives an error.