Oops--sounds like you're experiencing a technical glitch that we're familiar with! Updating your app in the App Store will fix the problem.
A recent version of the app (version 2.6) will only allow you to export 2018 reports, instead of 2017 reports.
If you update your app in the App Store here, you'll be able to export your 2017 reports as expected!
Questions? Email us at firstname.lastname@example.org!