I have a VFP8 MTDLL added to my ASP.NET solution. Running the web app is fine for a while, but after a random period, I get a message that looks like this:

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.scmal'.

Source Error: 


Line 151:        <add assembly="System.Drawing, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
Line 152:        <add assembly="System.EnterpriseServices, 
Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
Line 153:        <add assembly="*" />
Line 154:      </assemblies>
Line 155:    </compilation>
 

Source File: c:\winnt\microsoft.net\framework\v1.0.3705\Config\machine.config    Line: 153 

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