I configured a new custom event in windows server 8. No problem for the web application to write the exception to event log but every log begun with this: The description for Event ID from source cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event. The following information was included with the event: the message resource is present but the message is not found in the string/message table. Very lucky I found this Exact help which really save my day. And 1 last thing I need to do was reopen the event viewer.