So I have been getting this error for about 2 weeks. Thought it was related to the recent degrated ST performance but now that thing have gotten a little better, I am still getting this damn error each time the app loads.
Apologies for you current experience. If you have not already, please put a support ticket in with support@smartthings.com. If you have already sent a support ticket, PM me the ticket number and I will take a look at the status.