Looks like some issue with firmware version 7.1.0 build 4062-04. All of the users of my app have this version.
Are you testing with the same firmware and it's not crashing?
Is your app publicly available? Maybe post the access code and some of us can give it a test run.
Might be a long shot, but you could try emailing developer[at]roku.com to see if they can provide some crash logs for you.