Which version of Intel IPP did you use? How did you build customized DLL from Intel IPP libraries? You may need to include ippcorel.lib from lib directory.
Please check out "CustomDLL" sample from directory ipp-samplesadvanced-usagelinkagecustomdll for more details about the right steps to build customdll.
Secondly, please check out this file "redist.txt" under IPP root directory to find out what Intel IPP libraries can be redistributed.
Furthermore, read more information about redistributing Intel IPP libraries from our support site at:
Hope it helps.