Nullability of reference types in type of parameter 'value' of 'void HttpMessage.Payload.set' doesn't match implicitly implemented member 'void IMessage.Payload.set' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in return type of 'IEncoder? ApiHost.Encoder.get' doesn't match implicitly implemented member 'IEncoder IApiHost.Encoder.get' (possibly because of nullability attributes).

Nullability of reference types in return type of 'IApiHost? ApiNetServer.Host.get' doesn't match implicitly implemented member 'IApiHost IApiServer.Host.get' (possibly because of nullability attributes).

Nullability of type of parameter 'value' doesn't match overridden member (possibly because of nullability attributes).

Nullability of reference types in return type of 'IDictionary<string, object> ApiNetSession.Parameters.get' doesn't match implicitly implemented member 'IDictionary<string, object?> IApiSession.Parameters.get'.

Nullability of reference types in type of parameter 'value' of 'void ApiNetSession.Parameters.set' doesn't match implicitly implemented member 'void IApiSession.Parameters.set'.

Nullability of reference types in type of parameter 'value' of 'void ApiNetSession.this[string key].set' doesn't match implicitly implemented member 'void IExtend.this[string key].set' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.