The variable 'ex' is declared but never used

Possible null reference argument for parameter 'source' in 'ChatMessage? Enumerable.LastOrDefault<ChatMessage>(IEnumerable<ChatMessage> source)'.

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

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

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

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

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

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

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