Another one today . . . .

This one means that some process has a file locked in the Temporary ASPNet Files folder. Often it's the Index Service, in our case it was the on-access Virus Scan. Once again supporting the theory that these products cause more issues than they solve:


Server Error in '/MyWebApp' Application
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: 'mydll'.

Source Error:

<add assembly=<System.Drawing, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a>/>

<add assembly=<System.EnterpriseServices, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a>/>
<add assembly=<*>/>
</assemblies>

Source File: c:\winnt\microsoft.net\framework\v1.0.3705\Config\machine.config Line: 171