I'm reffering to this one. I've tried to use it from two different computers but always get this "Not Found" page. Is it just me or is this an ongoing issues that hasn't been resolved for a while? (I'm contacting you about this because the error message mentions contacting the project administrators and mentions you).
Topic on User talk:BDavis (WMF)/Archive 2
If you are ending up on the page you linked that sounds like a bug in the URLs generated by pagepile. That is one of Magnus' tools according to https://tools.wmflabs.org/admin/tool/pagepile. His enwiki user page recommends reporting issues at https://bitbucket.org/magnusmanske/