access is denied, assembly

jeg får en underlig periodisk fejl i min webapplikation.

jeg har importeret namespacet Microsoft.uddi.dll

nogle gange (ikke hver gang) jeg kører min side får jeg nedenstående fejl.

Hvis jeg sletter referencen til dll, filen og importerer den igen så virker siden igen.

Nogen der kan se hvad problemet er?

Fejl information:

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: 'Microsoft.Uddi'.

Source Error:
Line 197:        <add assembly="System.EnterpriseServices, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
Line 198:        <add assembly="System.Web.Mobile, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
Line 199:        <add assembly="*" />
Line 200:      </assemblies>
Line 201:    </compilation>


Source File: c:\windows\microsoft.net\framework\v1.1.4322\Config\machine.config    Line: 199

Assembly Load Trace: The following information can be helpful to determine why the assembly 'Microsoft.Uddi' could not be loaded.

=== Pre-bind state information ===
LOG: DisplayName = Microsoft.Uddi
(Partial)
LOG: Appbase = file:///c:/inetpub/wwwroot/controls
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: Microsoft.Uddi
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v1.1.4322/Temporary ASP.NET Files/controls/f8577664/7e27eae7/Microsoft.Uddi.DLL.
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v1.1.4322/Temporary ASP.NET Files/controls/f8577664/7e27eae7/Microsoft.Uddi/Microsoft.Uddi.DLL.
LOG: Attempting download of new URL file:///c:/inetpub/wwwroot/controls/bin/Microsoft.Uddi.DLL.
LOG: Publisher policy file is not found.
LOG: No redirect found in host configuration file (C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\aspnet.config).
LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v1.1.4322\config\machine.config.
LOG: Post-policy reference: Microsoft.Uddi, Version=2.0.2600.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35