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Unrecognized Tag Prefix

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Daniel
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Daniel asked on 26 Nov 2011, 02:39 AM
Following a crash of Visual Studio I'm experiencing an issue where all of my Telerik tags on my aspx pages have blue underlines.  Mousing over the underlined tags reveals the following error message "Unrecognized tag prefix or device filter 'telerik'".  I've also lost Telerik intellisense.  Does anyone know what the solution is? I've tried removing and re-adding all of the Telerik references and bin files.  This did not fix the problem.

Note, prior to Visual Studio crashing I had made only a few minor text edits to the project...nothing that major that I would expect could have caused these problems.  I'm using VS 2010.

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Princy
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answered on 28 Nov 2011, 04:30 AM
Hello,

Make sure that you set the TagPrefix as telerik.
ASPX:
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

Thanks,
Princy.
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Daniel
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answered on 30 Nov 2011, 07:59 PM
I did that already.  It doesn't solve the problem.  What else could cause a problem like this?
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Princy
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answered on 01 Dec 2011, 04:34 AM
Hello,

Take a look into the following forum thread.
unrecognized tag prefix or device filter 'telerik'.

Thanks,
Princy.
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Daniel
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answered on 06 Dec 2011, 11:45 PM
I attempted the fixes listed on that page.  Unfortunately none of them solved the problem.  Any other ideas?
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Sebastian
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answered on 07 Dec 2011, 10:30 AM
Hello Daniel,

I think that the information from this documenattion topic will help you eliminate the issue you are currently experiencing.

Regards,
Sebastian
the Telerik team
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Daniel
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answered on 08 Dec 2011, 10:03 PM
I've just tried everything on that page and still Visual Studio is not recognizing the telerik tag prefix.  What else could the problem be?
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Zÿm
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answered on 15 Dec 2011, 10:06 AM
I also tried these solutions, none of them works for me too. 

I started to get this error, after i have upgraded it to a new version. I am not installed telerik on computer. 
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Zÿm
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answered on 15 Dec 2011, 10:22 AM
Ok, found the answear. The Telerik.Web.Desing was of older version than Telerik.Web.UI;
In short, version mismatch in Telerik.Web.*.dll.
Still i am getting errors in Design View
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Bryan
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answered on 13 Sep 2012, 02:08 PM
I had a similar issue, and the solution was to replace all Telerik files in the Bin folder with the newer versions (not just Telerik.Web.UI.dll).  These files are typically located in your c:\program files\telerik\[release version]\Bin[.net version] folder.
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Map
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answered on 31 Dec 2013, 12:42 PM
Where I should write this prefix?
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headPropellerHead
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answered on 21 Oct 2016, 12:16 AM
I never could find the Telerik.Web.UI.dll in the GAC, in spite of running the update and "make a telerik website" wizards repeatedly.  Finally, I was able to find where the files were downloaded by Telerik (C:\Users\<user>\AppData\Roaming\Telerik\Updates\Telerik_UI_for_ASP.NET_AJAX_2016_3_1018_Dev_hotfix\Bin40).  I copied them to the bin folder of my project, made sure the references were set to the copy in the bin, and it worked.
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Daniel
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Map
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