i have 4 different targets in my project. I have some different view controllers in two of them. I face with a problem when i build with the 4th target. I can build with other 3 of them without any problem. Here is the error code Another problem is when i delete libcommonCrypto.dylib the 4th target can be builded as well but i can not test if the effected features are still working properly. Because i tested it with a wireless router and now i dont have it at office. So what would u suggest me in this situation ?