Non-nullable property 'Payload' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Dereference of a possibly null reference.

Possible null reference assignment.

Possible null reference assignment.

Possible null reference return.

Possible null reference argument for parameter 'source' in 'bool Enumerable.Any<BlockElement>(IEnumerable<BlockElement> source, Func<BlockElement, bool> predicate)'.

Dereference of a possibly null reference.

Dereference of a possibly null reference.

Possible null reference argument for parameter 'fieldName' in 'void ResultService.CreateNonMultipleValueResponse(List<NewResponseDto> responseDtos, NewResponseDto? existingResponse, string fieldName, string fieldValue, Guid choiceId, Guid answerId)'.