Trying to compile my first Ui [solved]

Hello all, I’m continuing the book “C++ GUI applications with Qt4” and am arriving at a new problem. When I try to compile the code of page 26—the Go to Cell Location example, I get the error “variable has incomplete type Ui::gotocelldialog” I thus see that the uic tool doesn’t convert the gotocelldialog.ui file into the C++ file ui_gotocelldialog.h. What am I doing wrong? Is there any big difference between Qt4 and Qt5? Thank you all for your help! Gabriel