As a requirement from apple store to upload unified iOS app starting 1st Feb 2015. We have migrated our classic API app to unified following the steps(http://developer.xamarin.com/guides/cross-platform/macios/updating_ios_apps/) however when we tried to compile the migrated unified api application we are getting "Unknown MSBuild failure. Please try building the project again" .
we tried with new unified project as well though it gives same error "Unknown MSBuild failure. Please try building the project again".
I have attached screenshot for additional reference.
Any help on this would be highly appreciated.