https://github.com/dougdellolio/gdax-csharp

I'm trying to get this working but when I try to build it says a few thjings don't exist.

Severity    Code    Description                 Project File    Line                                                                        Suppression State
Error       CS1003  Syntax error, ',' expected  GDAXClient      C:\Downloads\gdax-csharp-master\GDAXClient\Services\AbstractService.cs  70  Active

if (!httpResponseMessage.Headers.TryGetValues("cb-after", out var firstPageAfterCursorId))
{
    return pagedList;
}

var subsequentPages = await GetAllSubsequentPages<T>(uri, firstPageAfterCursorId.First());

pagedList.AddRange(subsequentPages);

return pagedList;

and:

Severity    Code    Description                                                     Project File    Line                                                                        Suppression State
Error       CS0103  The name 'cursorHeaders' does not exist in the current context  GDAXClient      C:\Downloads\gdax-csharp-master\GDAXClient\Services\AbstractService.cs  91  Active

if (!subsequentHttpResponseMessage.Headers.TryGetValues("cb-after", out var cursorHeaders))
{
    break;
}

subsequentPageAfterHeaderId = cursorHeaders.First();

I'm very confused...