Dereference of a possibly null reference.

Argument of type 'List<GameServerEvent?>' cannot be used for parameter 'entities' of type 'IEnumerable<GameServerEvent>' in 'Task DbSet<GameServerEvent>.AddRangeAsync(IEnumerable<GameServerEvent> entities, CancellationToken cancellationToken = default(CancellationToken))' due to differences in the nullability of reference types.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<GameServerDto>.ApiResponseDto(HttpStatusCode statusCode, GameServerDto result)'.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<BanFileMonitorDto>.ApiResponseDto(HttpStatusCode statusCode, BanFileMonitorDto result)'.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<DemoDto>.ApiResponseDto(HttpStatusCode statusCode, DemoDto result)'.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<UserProfileDto>.ApiResponseDto(HttpStatusCode statusCode, UserProfileDto result)'.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<ChatMessageDto>.ApiResponseDto(HttpStatusCode statusCode, ChatMessageDto result)'.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<AdminActionDto>.ApiResponseDto(HttpStatusCode statusCode, AdminActionDto result)'.

Possible null reference argument for parameter 'result' in 'ApiResponseDto<UserProfileDto>.ApiResponseDto(HttpStatusCode statusCode, UserProfileDto result)'.