Error link

Hello

I create a MFC project in VC++ 6.0, in my project i use a class write in C++ (use string type).

when i compile my project it appears error link like that:

"Linking...
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::~basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(void)" (??1?$basic_strin
g@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ) already defined in ocl.lib(ora.obj)
msvcprtd.lib(MSVCP60D.dll) : error LNK2005: "public: __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >(class basic_string<char,s
truct std::char_traits<char>,class std::allocator<char> >::allocator<char> const &)" (??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV?$allocator@D@1@@Z) already defined in ocl.lib(ora.obj)
LINK : warning LNK4098: defaultlib "LIBCMTD" conflicts with use of other libs; use /NODEFAULTLIB:library
Bin/BMSOracleView.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe."

please help me.

thanks a lot.