We're working on a solution right now. Thanks for the report Jonathan.
It worked fine for me a few minutes ago. If you continue to have problems accessing the training from your dashboard, try going to https://developers.mendix.com and access the training through the Training menu item at the top of the page.
Thanks for the response Mike, but even accessing the Training items through the pathway that you mentioned gives the same error.
Hi Jonathan, please try again. It should be fixed now.