Hello, lisa-deftdynamic.
There are times that your browser is full of frequently-accessed page resources, causing QuickBooks Online (QBO), to act unusual behavior. You can log in to your QBO account using a private browser. This is to rule out any browser-related issue.
Here are the keyboard shortcuts:
- Google Chrome: Ctrl + Shift + N
- Mozilla Firefox: Ctrl + Shift + P
- Safari: Command + Option + P
If it works, clear your browser's cache to speed up the loading process of the QBO website and for the system to start fresh. You can also switch to a different browser.
Once done, check if it still showing the application error. If so, we have a specialized team that is more knowledgeable about this kind of error code. Let me direct you to our Intuit Developers so you can ask questions from there and they can help you fix this.
I have these help articles in case you have questions about your account management.
Let me know if there's anything else that I can help you with. I'll be right here to assist.
