When switch to IL2CPP builds fails?

Hey Guys using unity version 4.6.6f2 when i make the build for arm 64 IL2CPP it shows this error :
Error building Player: Exception: /Applications/Unity/Unity.app/Contents/Frameworks/Tools/UnusedByteCodeStripper2/UnusedBytecodeStripper2.exe did not run properly!

i had used the patch 4.6.4p2 but still getting the same error my project i done i just need to upload the build please help me ASAP

Have you tried the latest Unity 4 patch release? As of 26 June, it’s 4.6.6p4.