Error with custom user controls

User controls that worked perfectly well with SF 3.x now product the following error :

Exception of type 'System.Web.HttpUnhandledException' was thrown.

Nothing in log files.

Hi Daz,

This is some server side error that comes from the code you use. Try running the project in debug mode to see where actually the error is thrown.

All the best,
Ivan Dimitrov
the Telerik team