Thank you for posting here in the Community. I’d like to help you get past the error so you can work on your company file with ease.
Can you provide more details on the steps you've taken so we can locate the root cause of the error message? If you could share some screenshot of the exact error you encounter, it'd be very helpful in determining the next steps to resolve the problem.
In the meantime, let's perform some basic troubleshooting to check if this is a browser-related issue. You can start by using a private window to start fresh.
Press Ctrl + Shift + N keys on your keyboard (Google Chrome).
Press Ctrl + Shift + P keys on your keyboard (Firefox or Internet Explorer).
Press Control + Option + P keys on your keyboard (Safari).
In addition, switching to a different browser (Internet Explorer, Chrome, and Firefox) will sometimes do the trick.
If the private browsing session works, you’ll need to clear your browser’s cache to prevent unexpected behavior in the product. Make sure to remember your saved information, such as login IDs and passwords. Check out this article for the steps: https://community.intuit.com/articles/1436727.
In case the same problem persists, please get back to me with the details and we’ll take it from there. Enjoy your day!