Unable to package with steam plugin

Development Platform & Builds
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at line 214 i see this :
[2017.03.08-00.18.29:882][ 41]UATHelper: Packaging (Windows (64-bit)): UnrealBuildTool: ERROR: No 32-bit compiler toolchain found in C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\cl.exe