Error validating OpenAPI using hidi preview

[darrelmiller]

Hidi version: 2.0.0-preview3+249ff45503c26a38cdf72fdc4972030ae4756e55

dotnet tool install -g Microsoft.openapi.hidi --prerelease

hidi validate -d https://raw.githubusercontent.com/github/rest-api-description/refs/heads/main/descriptions/api.github.com/api.github.com.yaml

This command gives the error:

crit: Microsoft.OpenApi.Hidi.Handlers.ValidateCommandHandler[0]
      Could not validate the document, reason: Object reference not set to an instance of an object.

[MaggieKimani1]

This is now fixed in v2-preview5