-20200 An application error has occurred while processing your request. This error is coming when I tried to open Expenses

Thank you for contacting the Community, Userconnect. I understand that this issue is urgent and I'm here to help you resolve it. 

Let's perform some basic troubleshooting on your account to determine why you're unable to open one of your bills to make a payment.

To begin, let's check if this is a browser-related issue. I suggest opening your account in a private browser, which ignores historical data. This will help us determine if the issue lies with your browser or elsewhere.

These are the keyboard shortcuts:

• Mozilla Firefox: CTRL + Shift + P
• Microsoft Edge: CTRL + Shift + N
• Google Chrome: CTRL + Shift + N
• Safari: Command + Shift + N

If the error is fixed after this, then the issue is likely caused by your browser. You'll want to clear your regular browser cache. Another option is to use other supported browsers.

If the issue still occurs after performing the troubleshooting, you'll want to contact our support team to have your account checked and get this behavior investigated further. Here's how to contact them:

1. Log in to your QuickBooks Online account.
2. Click Help (?).
3. Type in "Talk to a human," then press Enter.
4. Select Contact Support Team.
5. Type again Talk to a human and click Contact Support Team.
6. Choose a way to connect with us.

Additionally, feel free to check out this article for more information on financial reports to give you a snapshot of your business: Run reports in QuickBooks Online. 

Come back to this thread anytime for more bank account set-up and other QuickBooks-related queries. I'll be right here to assist you further. Take care.