Failed to create provisioning profile.

In Xcode I get the following errors when signing :

• Failed to create provisioning profile. There are no devices registered in your account on the developer website. Plug in and select a device to have Xcode register it.

• No profiles for 'app.name.com' were found Xcode couldn't find any iOS App Development provisioning profiles matching 'app.name.com

I logged in to my dev account in <Certificates, Identifiers & Profiles>, and created my device, and when I try to create a Profile I get the error : No Devices are available ,
If I click in create new device, and try to register my MacBook Pro, its says : The following devices are either already present and were not modified or contain invalid identifiers.

How can I resolved this ?