An application error has occurred while processing your request : 10000

Hey there, @root52.

Welcome aboard to Community. I'm happy to assist you with your error. 

This error can be caused by stored temporary internet files in the system. Below I have included a couple of steps to resolve this error for both browser and QuickBooks Online application:

Depending on which browser you're using, here are the instructions for all supported browsers on clearing cache and temporary internet files. 

• Firefox
• Chrome
• Safari (for Mac computers)
• Safari (for iPad/iPhone)
• Microsoft Edge

For the application, let's reset the app data:

1. Under the QuickBooks menu, click Sign Out.
2. Click the Help menu, and then choose Reset App Data.

If you're still having issues, or have any questions or concerns, feel free to reach back out anytime. I'm only a post away and will be happy to help you out. Take care!