From time to time (sporadically) the following error pops up in web applications that have localization turned on. Refresh the page, and the error goes away (but will eventually rear its ugly head again):

Item has already been added. Key in dictionary: "1" Key being added: "1" 
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: Item has already been added. Key in dictionary: "1" Key being added: "1"

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.  

Stack Trace: 


[ArgumentException: Item has already been added.  Key in dictionary: "1"  Key being added: "1"]
   System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +931
   System.Collections.Hashtable.Add(Object key, Object value) +11
   OakLeaf.MM.Main.Globalization.mmMessageManager.GetMessageCache(Object LanguagePk, Boolean ForceReload)
   OakLeaf.MM.Main.Globalization.mmMessageManager.GetMessageCache(Object LanguagePk)
   OakLeaf.MM.Main.Globalization.mmMessageManager.GetMessage(String messageKey, Object languagePK, Boolean returnMessageKeyIfNotFound)
   OakLeaf.MM.Main.Globalization.mmMessageManager.GetMessage(String messageKey, Object languagePK)
   OakLeaf.MM.Main.Web.UI.WebControls.mmLabel.LocalizeText(Object languagePK)
   OakLeaf.MM.Main.Web.UI.WebControls.mmLabel.LocalizeHandler(Object sender, mmLocalizeEventArgs e)
   OakLeaf.MM.Main.Web.UI.mmLocalizeDelegate.Invoke(Object sender, mmLocalizeEventArgs e) +0
   OakLeaf.MM.Main.Web.UI.mmBaseWebPage.OnLocalize(Object languagePK)
   OakLeaf.MM.Main.Web.UI.mmBaseWebPage.OnLoad(EventArgs e)
   System.Web.UI.Control.LoadRecursive() +35
   System.Web.UI.Page.ProcessRequestMain() +731

 


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Version Information: Microsoft .NET Framework Version:1.1.4322.573; ASP.NET Version:1.1.4322.573