Hi,
I can't see any correlation between QHash and this problem. From the error message you posted I understand that linker is complaining about resolving symbol for QLayout::addChildLayout

QHash is part of QtCore and QLayout is part of QtGUI. Usually linker complain about unresolved symbols when the library (libQtGUI) is missing or symbol is not in the library.

Check to have libQtGUI installed into your device and that Qt version you use in SB it's the same into the device.