If you are seeing this error when building a Flutter app for a physical iOS device, here is the solution.

CodePudding user response：

I had this error when building for a physical iOS device in Flutter or in the Runner.xcworkspace project. I spent probably 8-9 hours trying to remedy this error, following countless tutorials and answers on other StackOverflow questions. NOTHING worked.

Today, I coincidentally found the solution (in my case) and it may be the one for you if you're experiencing this error since Apple changed their Developer Relations Intermediate Certificate.

• Open Keychain Access, select login on the left pane, select Certificates at the top, search apple, delete all:

• Apple Distribution certificates

• Apple Development certificates

• Apple Worldwide Developer Relations Certification Authority certificates

• (DO NOT DELETE your Apple Push Services certificates

• 

• Click

• Type in your email (most likely your Apple ID).

• Select Save to Disk and choose your Downloads folder.

• Go to developer.apple.com.

• Click Account, sign in with your Apple ID / Developer Account.

• Click Certificates, IDs & Profiles.

• Again, revoke any Development/Distribution certificates.

• Click the plus icon, select Apple Development

• Upload the signing request you just made.

• Download the certificate.

• Click the certificate to add it to your Keychain.

• Repeat the bold steps for the Apple Distribution option.

• Open your Xcode workspace.

• Click your project, click your Target, click Signing & Capabilities

• If you see a red error below your Apple ID, click the button to resolve it.

You should then be good to go! I hope this helped you.