I have come up with a problem .Please help

I have compiled an example for ARM target from QT-Embedded examples
/examples/MainWindows/application

It got compiled for target without any errors. But once i execute my exe in my target it gives this error

For openfile() , Savefile()

Error: QFileDialog has not been declared. I hope there is some problems with libraries.

Now how do i solve this problem. Please help me.