Hi ivandesouza01,
This unexpected errors in QuickBooks Online are sometimes caused by a browser-related issue. You can try using a private or incognito window, to isolate browser-related issues. Then, clear your browser's cache.
Here's an article that will guide you through the process: How
do I clear my browser cache and temporary Internet files
Please know that I'm only a post away if you have any questions about QuickBooks.