Getting an error in making a simple diloag box

Hi,

I am a beginner in Symbian Programming and m trying to make a simple dialog box. The resource file is:
RESOURCE DIALOG r_example_dialog
{
title = "Information";

buttons = R_AVKON_SOFTKEYS_OK_CANCEL;
flags=EEikDialogFlagWait;

items =
{
DLG_LINE
{
type=EEikCtLabel;
control=LABEL
{
standard_font=EEikLabelFontAnnotation;
txt="Not enough memory";
};
}
};
}

and I am getting the following 2 errors:

1)Undefined symbol: 'int CEikBorderedControl::HasBorder(void) const (?HasBorder@CEikBorderedControl@@UBEHXZ)' referenced from 'const CMyDialog::`vftable' (??_7CMyDialog@@6B@~)' in guiAppUi.o
2)Undefined symbol: 'void CEikBorderedControl::SetAdjacent(int) (?SetAdjacent@CEikBorderedControl@@UAEXH@Z)' referenced from 'const CMyDialog::`vftable' (??_7CMyDialog@@6B@~)' in guiAppUi.o

Please help..