System.NullReferenceException: Object reference not set to an instance of an object. - error

[ignatandrei]

I have a Roslyn Source Code Generators examples with code on GitHub - https://github.com/ignatandrei/rsCG_examples

The code is pretty simple , but it gives the error
System.NullReferenceException: Object reference not set to an instance of an object.

The line is

__dapper__result = global::Dapper.TypeReader.TryGetReader<global::DapperExampleDAL.Person[]>()!.Read(__dapper__reader, ref __dapper__tokenBuffer);

You can find the example at https://github.com/ignatandrei/rsCG_examples , folder later_aotdapper\src\dapperexample
Please help

[ignatandrei]

this code

global::Dapper.TypeReader.TryGetReader<global::DapperExampleDAL.Person[]>();

gives null

[mgravell]

closing because taking new direction: DapperLib/Dapper#1909