Using CSS and JavaScript optimization in SharePoint 2013 results with error on SPRequestModule.IsExcludedPath -

i'm trying use built-in dot.net 4.5 feature web optimization (css , javascript minification) on sharepoint 2013 website , i'm having exception on ~ urls:

exception details: system.argumentexception: virtualpath

source error: unhandled exception generated during execution of current web request. information regarding origin , location of exception can identified using exception stack trace below.

stack trace:

[argumentexception: virtualpath]
microsoft.sharepoint.applicationruntime.sprequestmodule.isexcludedpath(string virtualpath) +278
microsoft.sharepoint.applicationruntime.spvirtualpathprovider.directoryexists(string virtualpath) +57
system.web.optimization.bundlehandler.remaphandlerforbundlerequests(httpapplication app) +136
system.web.synceventexecutionstep.system.web.httpapplication.iexecutionstep.execute() +182 system.web.httpapplication.executestep(iexecutionstep step, boolean& completedsynchronously) +165

version information: microsoft .net framework version:4.0.30319; asp.net version:4.0.30319.18408

any idea how solve this?

!!! updated on 12-03-2014!!!

first problem solved! error 404.0 server upon performing action bundle.

here's code skipping sharepoint virtual path validation mechanism:

applicationstartmodule.cs

using system; using system.collections.generic; using system.diagnostics; using system.linq; using system.text; using system.threading.tasks; using system.web;  namespace matrix.sharepoint.publishing.httpmodules {     public abstract class applicationstartmodule : ihttpmodule     {         private readonly static object _mutex = new object();         private static bool _initialized = false;          protected abstract void onstart();          public void init(httpapplication application)         {             if (!_initialized)                 lock (_mutex)                     if (!_initialized)                         application_start();         }          private void application_start()         {             _initialized = true;             onstart();         }          public void dispose() { }      } } 

rootvirtualpathprovider.cs

using microsoft.sharepoint.applicationruntime; using system; using system.collections.generic; using system.diagnostics; using system.linq; using system.text; using system.threading.tasks; using system.web.hosting;  namespace matrix.sharepoint.providers {     public class rootvirtualpathprovider : virtualpathprovider     {         public override string combinevirtualpaths(string basepath, string relativepath)         {             return previous.combinevirtualpaths(basepath, relativepath);         }          public override system.runtime.remoting.objref createobjref(type requestedtype)         {             return previous.createobjref(requestedtype);         }          public override bool fileexists(string virtualpath)         {             string patchedvirtualpath = virtualpath;              if (virtualpath.startswith("~/layouts", stringcomparison.invariantcultureignorecase))             {                 patchedvirtualpath = virtualpath.remove(0, 1);             }              return previous.fileexists(patchedvirtualpath);         }          public override system.web.caching.cachedependency getcachedependency(string virtualpath, system.collections.ienumerable virtualpathdependencies, datetime utcstart)         {             return previous.getcachedependency(virtualpath, virtualpathdependencies, utcstart);         }          public override string getcachekey(string virtualpath)         {             return previous.getcachekey(virtualpath);         }          public override virtualdirectory getdirectory(string virtualdir)         {            return previous.getdirectory(virtualdir);         }          public override virtualfile getfile(string virtualpath)         {             return previous.getfile(virtualpath);         }          public override string getfilehash(string virtualpath, system.collections.ienumerable virtualpathdependencies)         {             return previous.getfilehash(virtualpath, virtualpathdependencies);         }          protected override void initialize()         {             base.initialize();         }     } } 

is there best practice how use built-in .net 4.5 web optimization in sharepoint 2013?