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The error message "Some services cannot be created" in ASP.NET Core Web API while validating the service descriptor ServiceType means that one or more services specified in the service descriptor cannot be created. This could be because the dependencies required to create the service are not registered or there is an issue with the configuration of the services. To resolve this error, you will need to investigate the specific service(s) that are causing the issue and ensure that all dependencies required to create them are properly registered.