I'm glad to have you join the Community. You've reached the right place for assistance.
I'd like to take a further look into this so I can share the correct info. Are you using Standard Payroll or Advanced Payroll powered by Wagepoint? Please share as much detail about the issue you're having. Make sure to include screenshots of where you're seeing that the account is inactive. I'll be on standby. :)
Thanks for the good screenshot. Based on the screenshot, I see that there may be an inactive employee on the list. In order to run payroll successfully, you'd need active employees. I suggest going through your employee list and making sure none are inactive. You can do this by clicking Employees at the left navigation menu and filtering your employees by "Active". Make sure all the employees you're running payroll for aren't missing on that list. Let me know if you have questions.
You can run payroll using the free trial. It shouldn't be an issue at all. Could I have you clear cache and cookies on your browser? Doing this will help fix most issues the site may be having. Here's an article from our Community which will show you how to do that. Try this first and let me know if you're still getting the error message.