Server Error in '/' Application.

[Robert Leonard III]

Just two days ago this error started happening on our website.. as far as we
can tell nothing changed.. the error just popped up in the middle of a
business day and hasn't gone away since... Nobody here is a .net guru, as we
inherited this code and are in the process of hiring a new developer.. but
that doesn't help us till he/she actually IS hired.. any help and/or
pointers would be GREATLY appreciated!!!

Here is the error..
------------------------------------

Server Error in '/' Application.
--------------------------------------------------------------------------------

Specified argument was out of the range of valid values. Parameter name:
Index was out of range. Must be non-negative and less than the size of the
collection.
Description: An unhandled exception occurred during the execution of the
current web request. Please review the stack trace for more information about
the error and where it originated in the code.

Exception Details: System.ArgumentOutOfRangeException: Specified argument
was out of the range of valid values. Parameter name: Index was out of range.
Must be non-negative and less than the size of the collection.

Source Error:

An unhandled exception was generated during the execution of the current web
request. Information regarding the origin and location of the exception can
be identified using the exception stack trace below.

Stack Trace:


[ArgumentOutOfRangeException: Specified argument was out of the range of
valid values.
Parameter name: Index was out of range. Must be non-negative and less than
the size of the collection.]
System.Collections.CollectionBase.System.Collections.IList.get_Item(Int32
index) +199
Microsoft.Web.UI.WebControls.TreeNodeCollection.get_Item(Int32 index) +9
OptoControlPack.OptoRelationsControl.OnPreRender(EventArgs e) +98
System.Web.UI.Control.PreRenderRecursiveInternal() +62
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Control.PreRenderRecursiveInternal() +125
System.Web.UI.Page.ProcessRequestMain() +1489

 

[Ken Cox [Microsoft MVP]]

The error looks like it could be coming from the unsupported MS Treeview
control. What feeds the data for the treeview? Is it from a database or XML
file that has been given a new name, IP address or password?

Did anyone apply a .NET service pack recently?