I had this issue while adding resources to a static library.I think this can be a solution to your issue too. I think the bundle and .lib were not being built. I clicked on "edit schemes"(edit the scheme) and under the “Build” tab click the plus at the bottom and add the library target and library resources target.
For more info please refer this http://www.galloway.me.uk/tutorials/ios-library-with-resources/