I know what happened.
When you add the admob library to xcode, xcode change the paht of these two itens.
You have to rechange the path to the original.
Loojk for Library Search Paths inside Build Settings, there you'll find the paths to these two libraries, the correct paths are:
Xcode change them thinking they are wrong, it's because that your code don't compile. When you create a project from Scratch your paths are correct, you add a library and xcode create problems.