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

Converting null literal or possible null value to non-nullable type.

Possible null reference argument for parameter 'cnn' in 'Task<int> SqlMapper.ExecuteAsync(IDbConnection cnn, string sql, object? param = null, IDbTransaction? transaction = null, int? commandTimeout = null, CommandType? commandType = null)'.

Nullability of reference types in type of parameter 'value' of 'void GreetingEventAsyncMessageMapper.Context.set' doesn't match implicitly implemented member 'void IAmAMessageMapperAsync<GreetingAsyncEvent>.Context.set' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'void GreetingEventAsyncMessageMapper.Context.set' doesn't match implicitly implemented member 'void IAmAMessageMapper<GreetingAsyncEvent>.Context.set' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'void AddGreetingMessageMapper.Context.set' doesn't match implicitly implemented member 'void IAmAMessageMapper<AddGreetingCommand>.Context.set' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'void AddGreetingMessageMapper.Context.set' doesn't match implicitly implemented member 'void IAmAMessageMapperAsync<AddGreetingCommand>.Context.set' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'void GreetingEventMessageMapper.Context.set' doesn't match implicitly implemented member 'void IAmAMessageMapper<GreetingEvent>.Context.set' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'value' of 'void GreetingEventMessageMapper.Context.set' doesn't match implicitly implemented member 'void IAmAMessageMapperAsync<GreetingEvent>.Context.set' (possibly because of nullability attributes).