Cannot convert null literal to non-nullable reference type.

Non-nullable property 'Id' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Type' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'VCode' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'JsonLdMetadata' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'GestructureerdeIdentificator' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'CodeerSysteem' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'JsonLdMetadata' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'JsonLdMetadata' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Naam' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

Non-nullable property 'id' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'type' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'type' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'id' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'type' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'GestructureerdeIdentificator' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'id' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'type' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'id' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

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Nullability of reference types in return type of 'Task<PostalInformationResponse?> GrarClient.GetPostalInformation(string postcode)' doesn't match implicitly implemented member 'Task<PostalInformationResponse> IGrarClient.GetPostalInformation(string postcode)'.

'Contactgegevens.Empty' hides inherited member 'ReadOnlyCollection<Contactgegeven>.Empty'. Use the new keyword if hiding was intended.

'Postnamen.Empty' hides inherited member 'ReadOnlyCollection<Postnaam>.Empty'. Use the new keyword if hiding was intended.

'Datum' defines 'Equals' but not 'GetHashCode'

'Locaties.Empty' hides inherited member 'ReadOnlyCollection<Locatie>.Empty'. Use the new keyword if hiding was intended.

'Werkingsgebieden.Empty' hides inherited member 'ReadOnlyCollection<Werkingsgebied>.Empty'. Use the new keyword if hiding was intended.

'Lidmaatschappen.Empty' hides inherited member 'ReadOnlyCollection<Lidmaatschap>.Empty'. Use the new keyword if hiding was intended.

'HoofdactiviteitenVerenigingsloket.Empty' hides inherited member 'ReadOnlyCollection<HoofdactiviteitVerenigingsloket>.Empty'. Use the new keyword if hiding was intended.

'Vertegenwoordigers.Empty' hides inherited member 'ReadOnlyCollection<Vertegenwoordiger>.Empty'. Use the new keyword if hiding was intended.