I subscribed to the App Developer program. I paid the fee. I've done Certificates, Identifiers & Profiles. I added the app to App Store Connect.
xcode signing
I am getting the errors above. I don't have an iPhone phone. I'm developing on my macbook computer.
xcode device
How can I resolve this error?
As I can see in image that "Automatically Manage Signing" is enabled for this Xcode project. So Xcode is trying to create the provisioning profile for you but not able to create it.
B'coz you need to add account in Xcode from Xcode -> Preferences -> Account -> Click on + icon at bottom to add a new developer account.

You need to create provisioning profiles.

Once you have created provisioning profile, download it and install on your machine.
Please make sure the certificate used in cretation of the provisioning profile must be in your machine's keychain.
If those certificates not installed in your keychiain then you will see certificate issue in Xcode.
But I would recommend to create provisioning profile manually from apple developer portal as you can see and mainly you can know that which certificate and devices are used in the profile.
You can create following provisioning profiles for your app.
Development Profile
Adhoc Profile
App Store Profile
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