The Chart of Accounts is missed and I have the following error message: An application error has occurred. Please try again later. Could you help me please?

Good day, @userd-kebbe. Let me help you fix this. 

To start, let's perform some troubleshooting steps to fix this. There are times that the browser is full of frequently accessed pages, thus causing some unusual responses. Let's log in to your account using a private browser. This mode will not save any history, making it a great place to identify browser issues.

Access your QBO account in a private/incognito browser. You may use these shortcut keys that I've listed below:

• Google Chrome: press Ctrl + Shift + N  
• Mozilla Firefox: press Ctrl + Shift + P
• Safari: press Command + Shift + N

Then, open the chart of accounts to check. If it shows, go back to your regular browser and clear the cache to delete stored site data and improve the system performance. Also, you can use other supported browsers. It could be that the one you're currently working on has a temporary problem with QuickBooks. 

I'll be adding these articles to learn more about the chart of accounts: 

• Chart of Accounts Overview
• Add an account to your Chart of Accounts

Know that we're open 24/7 to help you. Just leave a comment down below if you have other concerns. Have a wonderful day.