ld: warning: directory not found for option '-L/...

1. ld: warning: ignoring file /Users/liuxiaochun/Library/Developer/Xcode/DerivedData/Doctor-hdhsvaazsmgxihcsslhrejgwtqoj/Build/Products/Debug-iphonesimulator/libPods-Doctor.a, file was built for archive which is not the architecture being linked (i386): /Users/liuxiaochun/Library/Developer/Xcode/DerivedData/Doctor-hdhsvaazsmgxihcsslhrejgwtqoj/Build/Products/Debug-iphonesimulator/libPods-Doctor.a
   或者
2. ld: warning: directory not found for option ‘-L/Users/liuxiaochun/Library/Developer/Xcode/DerivedData/Doctor-ctyyvzmbvnkvqycovyynaknprohe/Build/Products/Debug-iphonesimulator/AFNetworking’

解决办法：