Hi all!
The process that I usually use to register DOI's with CrossRef has recently stopped working, and the person who created this process has left my university. In short, I was using OAI files, crosswalking/transforming them with Oxygen, and then uploading them as xml files to CrossRef. Now, the crosswalking project I have is giving me a number of errors and I'm unable to identify why.

Does anyone have expertise in this or may be willing to help me figure out where things are breaking down?

Best,
Mackenzie