Error Regarding Key in Umbraco?

Server Error in '/' Application.

Item has already been added. Key in dictionary: 'wcms-adminmaster' Key being added: 'wcms-adminmaster'

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: 'wcms-adminmaster' Key being added: 'wcms-adminmaster'

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: 'wcms-adminmaster'  Key being added: 'wcms-adminmaster']
   System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +2904181
   System.Collections.Hashtable.Add(Object key, Object value) +11
   umbraco.cms.businesslogic.template.Template.initTemplateAliases() +183
   umbraco.cms.businesslogic.template.Template.set_Alias(String value) +151
   umbraco.cms.businesslogic.packager.Installer.InstallBusinessLogic(Int32 packageId, String tempDir) +1608
   umbraco.presentation.developer.packages.Installer.processInstall(String currentStep) +194
   umbraco.presentation.developer.packages.Installer.Page_Load(Object sender, EventArgs e) +329
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +13
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +43
   System.Web.UI.Control.OnLoad(EventArgs e) +98
   umbraco.BasePages.BasePage.OnLoad(EventArgs e) +12
   System.Web.UI.Control.LoadRecursive() +71
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4256

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

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