[Plugin: WooTumblog] Archives going to 404

I’ve added the WooTumblog plugin to my site, but the tumblog archive page, ie /tumblog/articles/ is showing a 404 page. I thought maybe there was something in my archive page, so I followed the directions and changed the Twenty Ten theme, and I’m still having the same problem:
https://blog.therauchmotel.com/tumblog/articles/

My category archives are working okay, so I’m not sure where the disconnect is.

Is there something I need to do to get the archive page working right?

Thanks!