iTunesConnect: Processing stopped for App submitted to testflight

Since today, each time I upload a build to Appstore with Application Loader my app is rejected on the basis of App Thinning error. I've tried to disable bitcode and upload build again but no use. Can someone help me on this error? enter image description here

After trying for 24 hours and sending like 10+ builds, I finally enabled bitcode in my project and got rid of sdks(in my case it was GooglePlus) which were not supporting bitcode. My build is accepted now. I'm not aware why Apple has imposed this thing all of sudden. Maybe they did mentioned it somewhere and I failed to pick it up.