IIS 7.5 : HTTP Error 500.19 - Internal Server Error - The requested page cannot be accessed because the related configuration data for the page is invalid.

Question

User962345173 posted

Hello everybody,

 I have a problem when trying to access to a website, which is stored on a Windows Server 2008 R2 Standard.

I don't understand what I have to do to fix this problem.

 Can anybody help me? This site must work before 17h (GMT+1)...

Thanks in advance.

 

Error Summary

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information

Module	IIS Web Core
Notification	BeginRequest
Handler	Not yet determined
Error Code	0x800700b7
Config Error	Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ArCacheItem'
Config File	\\?\C:\inetpub\wwwroot\TeamCentral\web.config

Requested URL	http://localhost:80/Teamcentral
Physical Path	C:\inetpub\wwwroot\TeamCentral
Logon Method	Not yet determined
Logon User	Not yet determined

<FIELDSET><LEGEND>Config Source</LEGEND>

  207:       <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
  208:       <add name="ArCacheItem" verb="*" path="*.ArCacheItem" type="DataDynamics.ActiveReports.Web.Handlers.WebCacheAccessHandler, ActiveReports.Web, Version=5.2.1013.2, Culture=neutral, PublicKeyToken=cc4967777c49a3ff" preCondition="integratedMode" />
  209:     </handlers>

</FIELDSET>

Answer 1

User962345173 posted

I deleted the line 208 in the file web.config, and it works!

Answer 2

User299556178 posted

For the reference, in case someone else is having the same problem, I will explain the key elements of the error.

"Config file" tells you which file the error is located. In this case, it was C:\inetpub\wwwroot\TeamCentral\web.config. So we know which file we need to look at.

"Config error" tells us what is wrong. In this case it is a duplicate collection of type 'add' which has the same name. This basically means that you have two identical tags. This sometimes happen if you manually edit the file, or some occasions, when you restore or migrate a website. The easiest thing to do is just search for the name in web.config, and identify the duplicate entries, and delete one of them (as you have done).

I hope this explanation helps someone else in the same situation.