Cannot query an access database if open

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I am having an issue currently, where if I open my Access database (It's not open Exclusively. Just open to where you see a list of tables/queries/etc), I get the following error on my website:

 

(Line 253 is highlighted)

 

Length cannot be less than zero.
Parameter name: length 
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: Length cannot be less than zero.
Parameter name: length

Source Error: 


Line 251://		try{
Line 252:
Line 253:			LeftNavMain();
Line 254:
Line 255:			string strSQL = "";


Source File: c:\Inetpub\Intranet\Testing\NewTemplate\phonedir.aspx    Line: 253 

Stack Trace: 


[ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length]
  System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy) +2848241
  Consolidated.Intranet.Error_Handler(String ex) +254
  Consolidated.Intranet.LeftNavMain() +511
  ASP.phonedir_aspx.__Render__control2(HtmlTextWriter __w, Control parameterContainer) in c:\Inetpub\Intranet\Testing\NewTemplate\phonedir.aspx:253
  System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +2065883
  System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
  System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +59
  System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +68
  System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
  System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
  System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +37
  System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
  System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
  System.Web.UI.Page.Render(HtmlTextWriter writer) +26
  System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
  System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
  System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
  System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1896

 

This particular function is used to create the side-menu, which is defined through the database.

 

Any and all help will be GREATLY appreciated! I've been experiencing this issue for about 2 months, now. It's never happened before.

 

Thanks in advance!

 

~Derek