Error - event code 3005

Not sure where to start.


Here is some info sent to me in an email.


Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 10/29/2013 9:23:15 AM
Event time (UTC): 10/29/2013 3:23:15 PM
Event ID: 5c9aa8faf6484ab1a81bcddef8cf4425
Event sequence: 3
Event occurrence: 1
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/3/ROOT-1-130275337953100885
    Trust level: Full
    Application Virtual Path: /
    Application Path: E:\Medicity\CORHIO\Prod\CORHIO_Prod_NexusManager\
    Machine name: DEN-DMZ-WEB1
 
Process information:
    Process ID: 7068
    Process name: w3wp.exe
    Account name: IIS APPPOOL\CORHIO_PROD_NexusManager
 
Exception information:
    Exception type: NullReferenceException
    Exception message: Object reference not set to an instance of an object.
 
Request information:
    Request URL: http://nexus.corhio.org/Instances/InstanceStatus.aspx?i=UCHGridTransformer 
    Request path: /Instances/InstanceStatus.aspx
    User host address: 10.20.0.50
    User: medicity
    Is authenticated: True
    Authentication Type: Forms
    Thread account name: IIS APPPOOL\CORHIO_PROD_NexusManager
 
Thread information:
    Thread ID: 4
    Thread account name: IIS APPPOOL\CORHIO_PROD_NexusManager
    Is impersonating: False
    Stack trace:    at Medicity.NexusManager.Instances.InstanceStatus.Page_Load(Object sender, EventArgs e)
   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
   at System.Web.UI.Control.OnLoad(EventArgs e)
   at System.Web.UI.Control.LoadRecursive()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)