В файле vendor/api-platform/schema-generator/src/SchemaGeneratorConfiguration.php

константу: public const GOOD_RELATIONS_URI = 'https://archive.org/services/purl/goodrelations/v1.owl';

нужно заменить на: public const GOOD_RELATIONS_URI = 'https://www.heppnetz.de/ontologies/goodrelations/v1.owl';