Server Error in '/' Application.

Question

When i run ASP.net Application.

i got error

Server Error in '/' 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: Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.

Source Error:

Line 8:  <configuration> Line 9:      <system.web> Line 10:         <compilation debug="true" targetFramework="4.0" /> Line 11:     </system.web> Line 12:

Source File: web.config Line: 10

Nimit Joshi · Answer

check out your application pool. Suppose the application pool is DefaultAppPool. To check out: Step 1: Select the website now go to the IIS option. Right click on it and select Basic Settings Step 2: Click on the Select to change the app pool: For Application Pool: Step 1: Right click on it and select as shown below: Step 2: Select the framework version:

Sumit Jolly · Answer

Start Menu -> Programs -> Microsoft Visual Studio -> Visual Studio Tools -> Visual Studio Command Prompt Run in command prompt: aspnet_regiis -i Make sure it is run at administrator check that the title starts with Administrator:

prince raj · Answer

Mr. Sumit Jolly How Can i register the framework. ? thanks in advance.

Sumit Jolly · Answer

Hi Prince you can try to register the framework explicitly: C : \WINDOWS\Microsoft . NET\Framework\v 4.0 . 30319 > aspnet_regiis - i Thnx @sumitjolly

prince raj · Answer

i also set default app pool to .net version 4.0 but i still face this problem. ??

prince raj · Answer

I cant find ASP in IIS (Default Website) that you show in step 1. i also i cant find asp option in add or remove windows feature. and how to register .net 4 for iis ? Please Reply

Nimit Joshi · Answer

Hey it may also be possible that you have not configured your IIS. Go to Control Panel-> Programs and Features-> Turn Windows Features on-> then select the IIS option category and choose all the important options like ASP.

Jignesh Trivedi · Answer

Hi This heppend when we have attribute of targetFramework=4.0 in the web.config but the App Pool is set to run ASP.NET 2.0. The targetFramework attribute is entirely unrecognized by ASP.NET 2.0 - so changing it to 2.0 won't have the desired effect. select website ->manage website->advanced setting> the first option change from classic to framework 4 integrated. it is also possible your iis is not register for the framework 4.0 just go to visual studio command prompt and write following command aspnet_regiis -i hope this will help you.

prince raj · Answer

i install .net 4.0 from your given link And how can i set website apppool ?

Khan Abrar Ahmed · Answer

Hi double click the website apppool and select the .Net Version and click on OK. after that restart the IIS.

Khan Abrar Ahmed · Answer

Hi Download the asp.net 4.0 from below link and install on server and then select the apppool frame work http://www.microsoft.com/en-us/download/details.aspx?id=17851 if you have issue again then let us know which IIS version you are using so i can give the steps for setting.

prince raj · Answer

I change it but nothing happen. i go to Internet Information Services (IIS) > Change .Net Version (i set it to 4.0) View Application pool > (i set all to 4.0) But nothing happen (i still see Version Information: Microsoft .NET Framework Version:2.0.50727.4984; ASP.NET Version:2.0.50727.4971) I restart pc and check .net version it automatically change to 2.0 How can i solve this ?

Nimit Joshi · Answer

Go to your IIS Manager. Check out on which application pool your website is running then you can use the framework.

prince raj · Answer

How can i set it to 4.0 ?

Khan Abrar Ahmed · Answer

Hi Then it might be two error the Application Pool for your site is configured for .NET Framework Version = v2.0.XXXXX .NET 4 isn't installed on your server.

prince raj · Answer

No its not solve this problem i tried.

Khan Abrar Ahmed · Answer

Hi You need to close the compliation tag.