Hello there, @jessicab1.
Glad you've reached out to us here in the Community. It's my pleasure to help you today.
To give you the right amount of information and solution to fix the error you have while working with QuickBooks, may I ask what specific area you're working in while getting the error?
In the meantime, you can try using the basic troubleshooting steps to resolve the issue. First, open your account using a private browser, you may use the following shortcut keys:
If it works fine using the private browser, open your account using the original browser and clear the browser's cache. You may also try accessing your account using another supported browser.
Keep me posted with the result. Have a good one!