title: generate-pch command failed with exit code 1 (use -v to see invocation) in Xcode9 Beta4
body: <p>I'm using Xcode9 Beta4 and when I build my project I'm getting this error <strong>generate-pch command failed with exit code 1 (use -v to see invocation)</strong> I've clean the project and deleted drive data but still getting the same problem.<a href="https://i.stack.imgur.com/c9yEn.png" rel="nofollow noreferrer">Please help me to remove this problem</a></p>