DTD error while loading Xbrl document

[EmeAsmIBM]

I receive an DTD error while loading an XBRL file.

var xbrlDoc = new XbrlDocument(); xbrlDoc.Load("./XMLData/response.xml");

The error is:

I can eliminate the error if I remove the schemaRef from the XML file. The disadvantage doing this is that file will not load properly.

How can I fix this issue?

[JeffFerguson]

Would you be able to ZIP up the XBRL instance document, and all related documents, and attach them to a reply? I'd be happy to take a look.

[EmeAsmIBM]

Dear,

This is the file that I'm using:
response.xml.zip
There are no other related documents.

Thank you in advance!

[ElgersNiels]

I'm encountering this issue as well.
I'm using documents from the same source as @EmeAsmIBM (nbb.be)

Any update on this?