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Missing language drop-down list

Versions: 4.6x, FAQ number: 194, Old FAQ number: 13274

Question:

Why can't I see the language drop-down list when I try to change the master language with ChangeMasterLanguage.aspx?

Answer:

The problem is the following line in ChangeMasterLanguage.aspx which is added by Visual Studio:

<?xml version="1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Remove it and you should be able to change the master language.

You will receive the following null reference exception, due to the fact that you have not chosen a language in the drop-down list.

Source Error:
_numberOfConvertedPages = _numberOfTotalPages = 0;
Line 39:    _changeMasterLanguageDB = new ChangeMasterLanguageDB();
Line 40:    ConvertTree(StartPage.PageLink, LanguageBranch.Load(NewMasterLanguage.SelectedLanguage).ID);
Line 41:    PagePrefix.Message += "Converted " + _numberOfConvertedPages + " of " + _numberOfTotalPages + " page(s)";
Line 42:   }

Source File: C:\Inetpub\wwwroot\EPi20\ChangeMasterLanguage.aspx.cs    Line: 40

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
   NewFunctions.ChangeMasterLanguage.ChangeMasterLanguage_Click(Object sender, EventArgs e) in C:\Inetpub\wwwroot\EPi20\ChangeMasterLanguage.aspx.cs:40
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +105
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +107
   System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

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