When I enter a bill, I've got a message unexpected error -1

Hi there,

It's vital you're able to use the program without getting any error messages. Don't worry, I'll be happy to assist you with this. 

First, I'd like to start by doing some troubleshooting to determine if this isn't a browser related issue. When was the last time you cleared cache and cookies on your browser? Doing this will help fix most issues the site may be having. Here's an article which shows you how to do that: How to clear Cache and Cookies. Give this a try and if you're still having issues, I recommend contacting our support team using this link.