ASP.NET - Trying to interpret the Stack Trace

I'm trying to get a handle on interpreting the stack trace:

Here's how I interpret the second, third and fourth lines of code:

1. The error, at its most fundamental level occurred at line 95 of the DataTableCollection class in the System.Data namespace (or the System.Data dll)
2. That error, in turn was prompted by my VB class module, PagePrepper on line 105.  
3. That error, in turn was prompted by my VB class module, PagePrepper .. etc. etc...

Am I interpreting the trace correctly?  Or, am I full of it?

[IndexOutOfRangeException: Cannot find table 0.]
   System.Data.DataTableCollection.get_Item(Int32 index) +95
   ParkAsset.ParkAsset.PagePrepper.DropDownListPrep(DropDownList ddl) in C:\Users\jdana\Documents\DSD\Parks03\101218 - Production Web Interface\ParkAsset\App_Data\PagePrepper.vb:105
   ParkAsset.ParkAsset.PagePrepper.PrepControls(Control ControlContainer, Int64 PrepType, Boolean Napalm, Int64 WorkOrderID) in C:\Users\jdana\Documents\DSD\Parks03\101218 - Production Web Interface\ParkAsset\App_Data\PagePrepper.vb:68
   ParkAsset.ParkAsset.PagePrepper.PrepControls(Control ControlContainer, Int64 PrepType, Boolean Napalm, Int64 WorkOrderID) in C:\Users\jdana\Documents\DSD\Parks03\101218 - Production Web Interface\ParkAsset\App_Data\PagePrepper.vb:87
   ParkAsset.reports.Page_Load(Object sender, EventArgs e) in C:\Users\jdana\Documents\DSD\Parks03\101218 - Production Web Interface\ParkAsset\reports.aspx.vb:27
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +220

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