The following error message appears when attempting to view a large report:
Unexpected Website Error "Request timed out."
NPM v10.4 and later
This error can occur when attempting to preview a very large report in the Orion Web Console.
There are several possible resolutions. The most common is that there is too much data for the report to return in a timely manner. To resolve this, break the report up in smaller reports so instead of reporting on all nodes have two reports that each handle half your nodes etc.
If you have done the above the issue maybe a website performance issue, and you can refer to the Slow website performance with a high percentage of 'Other Time' in hubble article.