IIS Error 3005

I posted this over at IIS.net and thought maybe someone here may have a solution.  I am getting an error on a app that has ran no problem for a number of years.  Also, this error does not appear on my workstation, only a majority of the users.  Here is the error from the event log.
Event code: 3005 Event message: An unhandled exception has occurred. Event time: 2/6/2014 9:44:21 PM Event time (UTC): 2/7/2014 2:44:21 AM Event ID: 1fc70fdbdb414b3eb3c2b08316313248 Event sequence: 14 Event occurrence: 1 Event detail code: 0 Application information: Application domain: /LM/W3SVC/1/ROOT/NewCalendar-4-130362146512153196 Trust level: Full Application Virtual Path: /NewCalendar Application Path: C:\inetpub\wwwroot\NewCalendar\ Machine name: NEWWEBSERV Process information: Process ID: 5512 Process name: w3wp.exe Account name: IIS APPPOOL\NewCalendarTest Exception infor ...