Policy not being applied to reference at this time error from hell

I've always compiled and tested web applications on the company server, but then I found myself in need of debugging so I started a project on the local machine. Then I started to get random errors when compiling the code.

===Errors from hell===
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: 'Some.DLL.Library'.

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 'Some.DLL.Library' could not be loaded.


=== Pre-bind state information ===
LOG: DisplayName = Some.DLL.Library
(Partial)
LOG: Appbase = file:///c:/inetpub/wwwroot/WebAppFolder
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: Some.DLL.Library
===Errors from hell===

Do you want to know what was wrong? The Indexing Service rings any bell?

PRB: Access Denied Error When You Make Code Modifications with Index Services Running