[Solved] ASP.Net Ajax Error: Cannot set properties of undefined

hello,

in my website update panel suddenly stop working even all ajax extender stop working when i check the console it shows following error

please advice

Uncaught TypeError: Cannot set properties of undefined (setting 'scriptsFailed')
    at Sys.WebForms.PageRequestManager._scriptIncludesLoadFailed (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)
    at Sys.WebForms.PageRequestManager.<anonymous> (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)
    at MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1
    at Sys._ScriptLoader._raiseError (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)
    at Sys._ScriptLoader._scriptLoadedHandler (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)
    at Sys._ScriptLoaderTask._completedCallback (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)
    at Sys._ScriptLoaderTask._scriptErrorHandler (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)
    at HTMLScriptElement.<anonymous> (MsAjaxJs?v=c42ygB2U07n37m_Sfa8ZbLGVu4Rr2gsBo7MvUEnJeZ81:1)