Strange (but need help)- Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.

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Hi All,

I have built one website using the .net framework 4.5 . Here is the code snippet from the Web.config file.

XML

<compilation debug="true" targetFramework="4.5"/>

I have hosted the same website in my local machine IIS7. While creating a new website, Application pool I selected as 4.0. When I try to access the same from the browser I am getting below error.

C#

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 14:   -->
Line 15:   <system.web>
Line 16:     <compilation targetFramework="4.5"/>
Line 17:     <httpRuntime/>
Line 18:     <pages controlRenderingCompatibilityVersion="4.0">

Source File: C:\inetpub\wwwroot\polygontechnologies.com\web.config    Line: 16 

Version Information: Microsoft .NET Framework Version:2.0.50727.5485; ASP.NET Version:2.0.50727.5491

So, as of now I have targetFramework="4.5" in web.config and in IIS application pool it is 4.0.

Anybody help me in fixing the issue.

Posted 20-Nov-15 13:45pm

PrashanthJagannath

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Suvendu Shekhar Giri · Answer 1 · 2015-11-20T18:16:00

Although you have clearly mentioned that you have selected
.NET Framework Version = v4.0.XXXXX in application pool, but your error says you still have .NET Framework Version = v2.0.XXXXX selected.

Go to the IIS again and check.

IIS  -- Right Click on your hosted website -- Advanced Settings -- Application Pool -- Select version 4.0

If this doesn't work then make sure that you have installed .Net framework 4.5 in your system.
How to find the .NET version?[^]

Hope, it helps :)