Xcode ios app development code signing

Question

When I run my app into my iphone I have this Warning:

unable to build chain to self-signed root for signer \"\".

My application Installed

Answer 1

I had the same problem and basically did like posted in the comment:

• Remove my account at Xcode / Preferences at the top right.
• open keychain. At the left "my certificates": Delete the Mac or iPhone etc Developer certificate.
• just starting Xcode again and creating a new account like one did when starting Xcode for the first time.