Unrecognized attribute 'targetFramework'.

Question

I'm trying to up load my site and I'm getting this error message:

Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive.

<compilation debug="true" targetFramework="4.0">

The site works fine on my local PC but won't open when I loaded it to my host and tried to view it online.

Answer 1

I had to register ASP.Net in IIS to get it resolved in the Windows Server 2008 R2. Sreenshot of the commands attched below

cd /d C:\Windows\Microsoft.NET\Framework\v4.0.30319

iisreset /stop

aspnet_regiis -i

iisreset /start

%systemroot%\system32\inetsrv\appcmd set config /section:isapiCgiRestriction /[path='%windir%\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll'].allowed:True 

%systemroot%\system32\inetsrv\appcmd set config /section:isapiCgiRestriction /[path='%windir%\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll'].allowed:True 

Answer 2

To fix this problem simply click the ASP.NET Version icon in the Site Tools section of Control Panel to switch the framework to 4.0.

Answer 3

Just had this issue deploying a new app to an old IIS box. The investigation led to the v4.5.1 run-time being installed but the app requiring v4.5.2

Nothing apart from installing the correct version of ASP .Net run-time was required.

Answer 4

Registering the framework with IIS is what worked for me:

C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319>aspnet_regiis -i

Answer 5

Create a new pool by selecting .Net Framework v4.0.3xxxxx

use the Manage Pipeline Mode: Integrated

Assign it to your site and done.

Answer 6

Saw the error "Unrecognized attribute 'targetFramework'" in the 'Console output' page of Jenkins on a build server. This was after I changed the 'target framework' for several projects from '.NET Framework 3.5' to '.NET Framework 4' and committed my changes.

In Jenkins the project settings had to be changed. For the solution the 'MSBuild Version' had to be changed from 'v3.5' to 'v4.0'.