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Wednesday, 24 March 2010

Unrecognized attribute 'targetFramework' when upgrading to .NET 4

I received and error saying "Unrecognized attribute 'targetFramework'. Note that attribute names are case-sensitive." with a description of "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."

Unlike .NET v3 and v3.5 which were essentially extensions to v2. .NET4 is an entirely self contained brand spanking new (and much lighter) framework. As such you will need to change your application pool like so:

Go to IIS and find the Application Pool you are using. Right click it and select Basic Settings then simply change the target framework to .NET Framework v4 as illustrated.

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Posted by Colin Farr at Wednesday, March 24, 2010 Labels: , , ,

17 comments:

  1. bandhan16 May 2010 at 20:23

    ain't working ,, still the same error !! :(

    ReplyDelete
  2. Colin Farr24 May 2010 at 00:58

    worked for me mate. sure you got the right application pool?

    ReplyDelete
  3. Anonymous18 June 2010 at 02:11

    not work

    ReplyDelete
  4. Anonymous19 May 2011 at 19:23

    Didn't exactly help, but try this fix that worked for me. I posted the response here (search for ‘goHiker’):

    http://forums.asp.net/p/1627935/4425127.aspx/1?p=True&t=634414101513664807

    ReplyDelete
  5. Rick23 May 2011 at 23:16

    Works for me. Thanks.

    ReplyDelete
  6. Maxim7 November 2011 at 20:00

    Great, exactly what I needed to make it work.
    Thanks.

    ReplyDelete
  7. kiran kadam24 September 2015 at 13:04

    not working

    ReplyDelete
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