The method getParameter() does not exist on Psr\Container\ContainerInterface. It seems like you code against a sub-type of Psr\Container\ContainerInterface such as Symfony\Component\Depend...tion\ContainerInterface.
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
The function Sonata\AdminBundle\Contr...RUDController::render() has been deprecated: since version 3.27, to be removed in 4.0. Use Sonata\AdminBundle\Controller\CRUDController::renderWithExtraParams() instead.
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If this is a false-positive, you can also ignore this issue in your code via the ignore-deprecated annotation