In recent weeks, we have had a number of customers reportings errors while installing Enterprise Forms.  The error message is along the lines of the following

ExceptionSystem.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.ThrowHelper.ThrowKeyNotFoundException() at System.Collections.Generic.Dictionary`2.get_Item(TKey key) at DotNetNuke.Services.EventQueue.EventQueueController.GetSubscribers(String eventName) at DotNetNuke.Services.EventQueue.EventQueueController.SendMessage(EventMessage message, String eventName) at DotNetNuke.Services.Installer.Installers.ModuleInstaller.Commit() at DotNetNuke.Services.Installer.Installers.PackageInstaller.Commit() at DotNetNuke.Services.Installer.Installers.PackageInstaller.Install() at DotNetNuke.Services.Installer.Installer.InstallPackages() at DotNetNuke.Services.Installer.Installer.Install()

1.  Open Web.config file located in the DotNetNuke root folder

2.  Locate line with “3.  Add the following immediately below that line

                4.  Save changes and try accessing the application again

 

Reference:ÂHOW TO FIX: "requires a ScriptManager on the page" Error when using .Net 3.5

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With the recent release of DotNetNuke version 5.0 the installer has somewhat changed significantly.  The following steps demonstrates how to install Enterprise Forms 5.0 in DotNetNuke 5.0 installer

1.  Log in as Host or user with Super Users privilege.

2.  From the Host menu select Module Definitions

 

3.  Ensure you are in Page Edit mode before selecting Install Module from the module’s menu

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For more information on the feature refer to here

For more information on the feature refer to here