It is because you delete .info because info plist file may content info related to your application icons and application name
This file is load application name and icons now you delete this file so it not able to load application name and icon name
if you find error "Couldn't find Info.plist file" than refer this links
can't find info.plist in xcode 4
Adding Info.plist in a XCode project
these may help you some how but don't delete info.plist
now crate new project and copy info.plist and add in you current project. or you can recreate info.plist file by refering this link How to regenerate an iPhone Xcode info.plist file hope this may help you.