LINK ERROR in VC++

I needed help making sense out of the following LNK error which i am getting.

SwitchFunctions error LNK2019: unresolved external symbol "__declspec(dllimport) ??$?8DU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@PBD@Z" (__imp_??$?8DU?$char_traits@D@std@@V?$allocator@D@1@@开发者_如何学Gostd@@YA_NABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@PBD@Z) referenced in function "??$find@Viterator@?$vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$allocator@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@@std@@PBD@std@@YA?AViterator@?$vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$allocator@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@@0@V120@0ABQBD@Z" (??$find@Viterator@?$vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$allocator@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@@std@@PBD@std@@YA?AViterator@?$vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@V?$allocator@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@2@@0@V120@0ABQBD@Z)

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Have you checked whether you have included all necessary dlls or lib files in your project settings?

Such an error usually indicate that you have used a function which definition is found, but implementation is not. Usually in the case of external libraries, the implementation is inside a dll or a static lib. Failure to provide the dll or the static lib will cause the linking to fail.

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Which version of Visual Studio are you using? This might be relevant for VS2005: Link error using a CString derived class from a DLL