Error : System.Runtime.InteropServices.COMException, on accessing visio document from c# asp.net on iis7

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 3/7/2013 1:16:38 PM
Event time (UTC): 3/7/2013 11:16:38 AM
Event ID: c42ed8de927c42ab8745f8b11f8d8cab
Event sequence: 58
Event occurrence: 4
Event detail code: 0
 
Application information:
    Application domain: /LM/W3SVC/2/ROOT-5-130071282829022135
    Trust level: Full
    Application Virtual Path: /
    Application Path: C:\SoftQ\
    Machine name: DEVG6-PC
 
Process information:
    Process ID: 5068
    Process name: w3wp.exe
    Account name: IIS APPPOOL\SoftQ
 
Exception information:
    Exception type: COMException
    Exception message:

An exception occurred.
   at Gids.Ecm.Utils.ErrorLogManager.Catch(Exception ex) in C:\Users\Administrator\Desktop\Ecm\EcmSolution\Gids.Ecm\Gids.Ecm.Utils\ErrorLog.cs:line 11
   at frmJobTitles.btnSave_Click(Object sender, EventArgs e)
   at Telerik.Web.UI.RadButton.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 
Request information:
    Request URL: 
    Request path: /Forms/frmJobTitles.aspx
    User host address: ::1
    User: 
    Is authenticated: False
    Authentication Type: 
    Thread account name: DevG6-PC\Administrator
 
Thread information:
    Thread ID: 13
    Thread account name: DevG6-PC\Administrator
    Is impersonating: False
    Stack trace:    at Gids.Ecm.Utils.ErrorLogManager.Catch(Exception ex) in C:\Users\Administrator\Desktop\Ecm\EcmSolution\Gids.Ecm\Gids.Ecm.Utils\ErrorLog.cs:line 11
   at frmJobTitles.btnSave_Click(Object sender, EventArgs e)
   at Telerik.Web.UI.RadButton.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
 
 
Custom event details: