[M4IF Technotes] the problem happening in link

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Hi all
The following happened when I rebuilt the Imp1(2001)
Linking...
Executiv.obj : error LNK2001: unresolved external symbol "public: virtual class Decoder * __thiscall InputSensorImp::CreateDecoder(class DecoderConfigDescriptor *,class QoS_Descriptor *,class Decoder *)" (?CreateDecoder   InputSensorImp@@UAEPAVDecoder
@@PAVDecoderConfigDescriptor@@PAVQoS_Descriptor@@PAV2@@Z)
Executiv.obj : error LNK2001: unresolved external symbol "public: virtual void __thiscall InputSensorImp::DeleteObject(void)" (?DeleteObject   InputSensorImp@@UAEXXZ)
./Debug/Im1Player.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.
Any answer is appreciated very much.
Best regards
Luoba Hwang
Donghua University
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡h8f   gentek.com.cn
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2002-11-05