I'm working with Xcode 7.2 on an iOS app in swift when suddenly got the following error at build time (replaced User and app name by variables):
<unknown>:0: error: unexpected input file: /Users/($User)/Code/($appname)/($appname)/Base.lproj/Main.storyboard
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swiftc failed with exit code 1
It seems your project cannot able to find
You may just look in
/projectName/projectName/Base.lproj. The storyboard is there. You can drag it into Xcode and its as good as new.