VC++ error C2440 with combined use of non-type template parameters, C++ (vc++)

VC++ error C2440 with combined use of non-type template parameters

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Compilation time: 0.48 sec, absolute service time: 1.12 sec

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Error(s):

source_file.cpp(4) : error C2440: 'specialization' : cannot convert from 'void (__cdecl *)(void)' to 'void (__cdecl *)(void)'
        None of the functions with this name in scope match the target type
        source_file.cpp(4) : see reference to class template instantiation 'ss<I>' being compiled