error LNK2019: unresolved external symbol "public: class ATL::CStringT

[Cris]

Hi
I´m converting a VC6 Project to VC7 and I´m having the
follow problem:

error LNK2019: unresolved external symbol "public: class
ATL::CStringT<char,class StrTraitMFC<char,class
ATL::ChTraitsCRT<char> > > __thiscall
CdbLastOLEError::GetDescription(void)" (?
GetDescription@CdbLastOLEError@@QAE?AV?$CStringT@DV?
$StrTraitMFC@DV?$ChTraitsCRT@D@ATL@@@@@ATL@@XZ) referenced
in function "public: __thiscall CTest::CTest(class
ATL::CStringT<char,class StrTraitMFC<char,class
ATL::ChTraitsCRT<char> > >)"

Does anyone knows what´s the problem and how to solve?
Thanks for any help...
Cris