Ошибка при компиляции

[Stim777]

Подскажите как исправить эту ошибку

mwldsym2.exe: Undefined symbol: 'void CStim777Container::ConstructL(void) (?ConstructL@CStim777Container@@AAEXXZ)'
mwldsym2.exe: referenced from 'class CStim777Container * CStim777Container::NewL(class TRect const &, class CCoeControl const *, class MEikCommandObserver *) (?NewL@CStim777Container@@SAPAV1@ABVTRect@@PBVCCoeControl@@PAVMEikCommandObserver@@@Z)' in Stim777Container.cpp:86
mwldsym2.exe: Undefined symbol: 'void CStim777Container::HandleLabel4StateChangedL(class CCoeControl *, enum MCoeControlObserver::TCoeEvent) (?HandleLabel4StateChangedL@CStim777Container@@IAEXPAVCCoeControl@@W4TCoeEvent@MCoeControlObserver@@@Z)'
mwldsym2.exe: referenced from '.data' in Stim777Container.o
mwldsym2.exe: Undefined symbol: 'void CStim777Container::HandleLabel4RequestingFocusL(class CCoeControl *, enum MCoeControlObserver::TCoeEvent) (?HandleLabel4RequestingFocusL@CStim777Container@@IAEXPAVCCoeControl@@W4TCoeEvent@MCoeControlObserver@@@Z)'
mwldsym2.exe: referenced from '.data' in Stim777Container.o

[truf]

cpp файл с реализацией CStim777Container в mmp файле подключен?