ASP.Net and VB 6 COM Interop

[roy]

I try to call com written in VB 6.0., some time it works
fine, some time I got the following message:

Server Error in '/GISOnlineReservation' Application.
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Configuration Error
Description: An error occurred during the processing of a
configuration file required to service this request.
Please review the specific error details below and modify
your configuration file appropriately.

Parser Error Message: Access is
denied: 'Interop.GISOnlineRes'.

Source Error:
Line 196: <add
assembly="System.EnterpriseServices, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
Line 197: <add
assembly="System.Web.Mobile, Version=1.0.5000.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
Line 198: <add assembly="*"/>
Line 199: </assemblies>
Line 200: </compilation>
Source File: c:\windows\microsoft.net\framework\v1.1.4322
\Config\machine.config Line: 198

Assembly Load Trace: The following information can be
helpful to determine why the
assembly 'Interop.GISOnlineRes' could not be loaded.
=== Pre-bind state information ===
LOG: DisplayName = Interop.GISOnlineRes
(Partial)
LOG: Appbase =
file:///c:/inetpub/wwwroot/GISOnlineReservation
LOG: Initial PrivatePath = bin
Calling assembly : (Unknown).
===

LOG: Policy not being applied to reference at this time
(private, custom, partial, or location-based assembly
bind).
LOG: Post-policy reference: Interop.GISOnlineRes
LOG: Attempting download of new URL
file:///C:/WINDOWS/Microsoft.NET/Framework/v1.1.4322/Tempor
ary ASP.NET
Files/gisonlinereservation/2fa2f700/aa114427/Interop.GISOnl
ineRes.DLL.
LOG: Attempting download of new URL
file:///C:/WINDOWS/Microsoft.NET/Framework/v1.1.4322/Tempor
ary ASP.NET
Files/gisonlinereservation/2fa2f700/aa114427/Interop.GISOnl
ineRes/Interop.GISOnlineRes.DLL.
LOG: Attempting download of new URL
file:///c:/inetpub/wwwroot/GISOnlineReservation/bin/Interop
...GISOnlineRes.DLL.
LOG: Policy not being applied to reference at this time
(private, custom, partial, or location-based assembly
bind).
LOG: Post-policy reference: Interop.GISOnlineRes,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=null


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Version Information: Microsoft .NET Framework
Version:1.1.4322.573; ASP.NET Version:1.1.4322.573
Anyone know why? Thanks.
..