BC30560: 'ScriptManager' is ambiguous in the namespace 'System.Web.UI'.
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i've upgraded my website upto dotnetnuke 6.2.9 and now i wanted to upgrade to dotnetnuke 7.0.0 but everytime when i change the .net framework to 4 it gives me the following error message.
Server Error in '/' Application.
Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: BC30560: 'ScriptManager' is ambiguous in the namespace 'System.Web.UI'.
Source Error:
Line 496: 'register the override CSS file to take care of the DNN default skin problems
Line 497: Dim cssOverrideUrl As String = _panel.Page.ResolveUrl(moduleFolderPath & "EditorOverride.css")
Line 498: Dim pageScriptManager As ScriptManager = ScriptManager.GetCurrent(_panel.Page)
Line 499: If (Not (pageScriptManager Is Nothing)) AndAlso (pageScriptManager.IsInAsyncPostBack) Then
Line 500: _panel.Controls.Add(New LiteralControl(String.Format("", _panel.Page.Server.HtmlEncode(cssOverrideUrl))))
Source File: C:\inetpub\vhosts\probebattery.wowinteractive4.co.za\httpdocs\App_Code\RadEditorProvider.vb Line: 498