What happened to the "Learn To Play The Ukulele" links?

When I click on Learn To Play The Ukulele a fatal error message shows up. Also happens when I try to access Ukulele Underground.com and try to click on Song Library, Courses, Lessons, and Member Pricing. The only part of Ukulele Underground that doesn't show a "fatal error" message is the Forum part of the site. Could someone enlighten us as to what is going on? Thanks for any info.

Same here. Something's broken.