Can't Login – Hours Keeper Pro - Timesheet, Tracking & Billing Review

After using this app for more than two years, it now won't allow me to login. It says 'there is no user with that email in the system'. So naturally I tried every other email I have ever had. Nope. No can do. So what do I do now? All my tax information is located in the system. Otherwise, this has been a great app until now.
Review by Useless App1029 on Hours Keeper Pro - Timesheet, Tracking & Billing.