error LNK2019: unresolved external symbol

error LNK2019: unresolved external symbol

2>Linking...
2>Chen-Image_IPP.lib(ChenImage.obj) : error LNK2019: unresolved external symbol _ippiMean_StdDev_32f_C1R@24 referenced in function "int __cdecl ChenImage_imageMeanStdDev(int,int,short const *,float *,float *)" (?ChenImage_imageMeanStdDev@@YAHHHPBFPAM1@Z)
2>Chen-Image_IPP.lib(ChenImage.obj) : error LNK2019: unresolved external symbol _ippiConvert_16s32f_C1R@24 referenced in function "int __cdecl ChenImage_imageMeanStdDev(int,int,short const *,float *,float *)" (?ChenImage_imageMeanStdDev@@YAHHHPBFPAM1@Z)
2>Chen-Image_IPP.lib(ChenImageDCT.obj) : error LNK2001: unresolved external symbol _ippiConvert_16s32f_C1R@24

what is the problem here?
thank you
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