Unable to create swagger.json with custom base controller

I have a controller say 'SampleController' that uses 'MyControllerBase'(from a NuGet package) as a base class.

I am trying to add API documentation using swagger but the swagger is unable to fetch 'SampleController' thus cannot create swagger.json.

I am getting the error "fetch error: /swagger/v1/swagger.json"

'MyControllerBase' inherits 'ControllerBase' so 'SampleController' is working as an API should work.

How can I tell swagger to use 'MyControllerBase' to find Controllers

From Nuget Package:

namespace My.ApiFormatter.Controller
{
  public abstract class MyControllerBase<T> : ControllerBase, IFilterableController
  {
    public virtual Dictionary<string, IFilterMapper> FilterWhitelist => new Dictionary<string, IFilterMapper>();
  }
}

Implementation:

  [Route("api/[controller]")]
  [ApiController]
  public class SampleController : MyControllerBase<ExampleData>
  {
    [HttpGet]
    public override ActionResult<CollectionEnvelope<ExampleData>> GetAll()
    {
      var results = ExampleDatas
        .Where(x => x.Key > (Info.PageSize * Info.SkipPages)
            && x.Key <= (Info.PageSize * (Info.SkipPages + 1)))
        .Select(y => y.Value).ToList();

      var collectionEnvelope = GetCollectionEnvelope(results, ExampleDatas.Count);
      return Ok(collectionEnvelope);
    }
  }