On SharePoint 2010 you will run into the following error :

Log Name        :  Application
Source             :  Microsoft-SharePoint Products-SharePoint Foundation
Date                :  9/27/2010
Event ID          :  7043
Task Category  :  Web Controls
Level                :  Error
Keywords         :
User                 :  MSS\SPFARM
Computer         :  MOSSSERVER
Description       : 

Load control template file /_controltemplates/TaxonomyPicker.ascx failed: Could not load type  'Microsoft.SharePoint.Portal.WebControls.TaxonomyPicker' from assembly 'Microsoft.SharePoint.Portal, Version=14.0.0.0, Culture=neutral,  PublicKeyToken=71e9bce111e9429c'.

 

Here's how it looks it in the Application logs

 

Untitled

 

 

Cause

The file drive:\Program Files\Common Files\Web Server Extensions\14\TEMPLATE\CONTROLTEMPLATES\TaxonomyPicker.ascx is badly formed and  doesn't compile.

 

Solution

You can change the bad syntax of the file as follows

  • Navigate to /14/ControlTemplates/TaxonomyPicker.ascx user control
  • Open the user control in a text editor and locate the first line
  • Find the character string , and replace with a comma ‘,’ (without quotes).
  • Save the user control.

 

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UPDATE

Sometimes, the error does not go away even after following the steps listed above. In such cases, the fix is to rename the 'TaxonomyPicker.ascx' to  something like 'TaxonomyPicker.ascx_broken' so that we do not try to recompile it each time the AppPool is started. The user control is never used  within SharePoint and therefore serves no real purpose.