iOS 'iPhone Developer' doesn't match any valid certificate/private key pair in Keychain

[MacBook MH]

When compiling I get this error. Eventhough I compiled before, never this message showed up, but now (i didn't change any code, just left the computer running and got a shower) it always shows up when I compile.

Code Sign error: The identity 'iPhone Developer' doesn't match any valid certificate/private key pair in the default keychain.


What is this? I googled it but came to no answers at all...
Please help

 

[cnstoll]

Make sure you've followed the instructions for installing a valid provisioning profile. They can be found on the iOS Dev Center "Provisioning Portal" page under Provisioning and How To.

https://developer.apple.com/ios/manage/provisioningprofiles/howto.action

Sounds like that's not set up right. This is happening when you try to build for device right?

Actually, the most important thing for you might be the Certificates tab How To, if you haven't set that up correctly.

Also see:

http://mobile.tutsplus.com/tutorial...stall-apps-on-iphone-devices-for-development/