When I try to remove a smartapp or edit a smartapp I get an error message in a red box that says “An unexpected error occurred.” This has been happening for weeks and I need a resolution quickly.
Have you tried reomving through the ide http://ide.smartthings.com ?
My Locations -> List Smart Apps -> Click Edit -> Click Uninstall next to that app
I had a similar issue. No matter how I tried to remove it, nothing happened…just repeated errors. Drop a line to Support. If they can’t figure out how to help you, they can manually remove the app. That’s what they ended up doing for me.