how to solve library not found for -liPhone-lib in Xcode?

Hi I am working on unity to objective c communication.

I have done all steps form the blog http://alexanderwong.me/post/29949258838/building-a-ios-unity-uiview-uiviewcontroller.

The platform currently working is

xcode: 4.5

unity :3.4

When build the project ,If set architecture armv7 , got above error "ld: library not found for -liPhone-lib clang: error: linker command failed with exit code 1 (use -v to see invocation)"

If set architecture armv6 , Xcode build the project,but got popup of "xcode can not run usuing selected device Choose a destination with a supported architecture in order to run on this device "

I am working on the issue since last 3 days,please let me know if anyone has the answer

Thanks