What does the error message mean and how to resolve the situation?
Cause of the Error
The error above occurs because the server is receiving an invalid response from another server and the cookies or cache on the browser are outdated.
If the browser history, cache and cookies have not been cleared for a while, the browser will use old data to load the website which can trigger errors across different pages.
Resolution
To fix this, simply clear your browser’s history, cache and cookies for "All Time."
This should stop the error from appearing in Dooap going forward.