LNK 2019 :unresolved extrenal symbol _clGetPlatformIDs

Hi all ,
I m new to Opencl and I am facing the following problem

eror LNK2019: unresolved external symbol_clGetPlatformIDs@12 referenced in function -main;

I guess this has something to do with the libraries but I have all the available libs linked in project property->linked->input and added the following

C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\lib\x64\OpenCL.lib
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\lib\x64\nvcuvenc.lib
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\lib\x64\npps.lib
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\lib\x64\nppi.lib
C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v5.5\lib\x64\nppc.lib
but still I am getting the same error…

Any help would be of great help

Piyush