Adding a Widget Extension target to a new or existing iOS project leads to a bogus error when building the project: Cannot find 'ConfigurationIntent' in scope. Cleaning DerivedData / project does not help.

CodePudding user response：

It turns out that if you have a Class Prefix assigned to your xcode project document settings, xcode will silently add the prefix to the auto-built configuration intent class but this isn't obvious because the configuration itself does not contain a prefix.

In my case I had a prefix TDD. I spotted the file TDDConfigurationIntent.swift in the build folder. The solution is to either rename the configuration intent manually OR remove the class prefix in project document settings.