Property Has a Previous Declaration
问题 I tried adding XMPP framework into my ios project and I couldn't get it working. Turns out I added it incorrectly, So I tried removing it and now without XMPP I am getting these errors: Thanks in Advance! 回答1: This could also happen because of CocoaPods . I had this issue with version cocoapods-0.39.0 , downgrading to cocoapods-0.38.2 fixed it for now. 回答2: You have two copies of AFNetworking in your project. Delete one of them. ...or better yet, use CocoaPods to integrate AFNetworking and