Heroku error ? sites down

Is anybody getting a heroku error when access your site? both my sites give this error when accessed through custom domain. it worked till yesterday.

Application error

An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail

sites are back now. did someone at boundless accidentally pull a plug?

I was getting this error repeatedly yesterday.

I’ve found it often occurs if I’m playing around with custom CSS in the past, but if this was happening to you too, there may be something larger at play.