IOS build error

The app works perfectly at design time but when I try to build I get this error..

Thanks in advance!

Failed running /Applications/Unity/Unity.app/Contents/Tools/UnusedByteCodeStripper2/UnusedBytecodeStripper2.exe --api NET_2_0_Subset -out "/Users/mudo/Desktop/YincanYDemos/Temp/StagingArea/Data/Managed/tempStrip" -l none -c link -b true -x "/Applications/Unity/PlaybackEngines/iOSSupport/Whitelists/Core.xml" -f "/Applications/Unity/Unity.app/Contents/il2cpp/LinkerDescriptors" -x...

IOS build error