what does warning C4251 class needs to have dll interface to be used by clients of class mean?

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what does C4251 class needs to have a dll interface warning mean?<br/>
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Warning 1 warning C4251: reg::RegPartBase::mPartText : class std::basic_string<_Elem,_Traits,_Alloc> needs to have dll-interface to be used by clients of class reg::RegPartBase c:srcpplibfilepreviewx64debugRegPart.h 32 1 LibFilePreview
I have a class in a DLL. In the project that uses the DLL there is a header file that declares the class with __declspec(dllimport).
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<pre class="prettyprint class __declspec(dllimport) RegPartBase
{

public:
wstring mPartText ;
PartType mPartType ;
...
} ;
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