Check out example codes for ""Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepositoryInterface", but its service could not be found. Make sure the service exists and is tagged with "doctrine.repository_service".". It will help you in understanding the concepts better.
Code Example 1
It should “just work”. But check your services.yaml file to make sure that the Repository directory is not in the “exclude” for the App\ registration line.
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