“Unknown error occurred” message on the generic yellowish & blue page?
Of course, sometimes they get a bit more detailed, but you still get stuck without enough info.
To Avoid this in development SharePoint sites is to open the web.config and make two tweaks so it gives the familiar ASP.NET yellow screen of death (YSOD) with the true exception and underlying call stack:
- Turn the call stack on by searching for <SafeMode … CallStack=”false” …> and change it to CallStack=”true”.
- Turn off the SharePoint error pages by turning off custom error pages: change <customErrors mode=”On” /> to mode=”Off”.