Unable to use @html.ejs().gantt("gantt") in my project

<configuration>
  <configsections>
    <sectiongroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
      <section name="host">
      <section name="pages">
  <system.web.webpages.razor>
    <host factorytype="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    <pages pagebasetype="System.Web.Mvc.WebViewPage">
      <namespaces>
        <add namespace="System.Web.Mvc">
        <add namespace="System.Web.Mvc.Ajax">
        <add namespace="System.Web.Mvc.Html">
        <add namespace="System.Web.Routing">
        <add namespace="WebApplication4">
        <add namespace="Syncfusion.EJ2">
        <add namespace="Syncfusion.Mvc.Shared">
        <add namespace="Syncfusion.Mvc.Schedule">
        <add namespace="Syncfusion.Mvc.Tools">
        <add namespace="Syncfusion.JavaScript">
        <add namespace="Syncfusion.MVC.EJ">
  <appsettings>
    <add key="webpages:Enabled" value="false">
  <system.webserver>
    <handlers>
      <remove name="BlockViewHandler">
      <add name="BlockViewHandler" path="*" verb="*" precondition="integratedMode" type="System.Web.HttpNotFoundHandler">
  <system.web>
    <compilation>
      <assemblies>
        <add assembly="System.Web.Mvc, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
        <add assembly="Syncfusion.EJ2, Culture=neutral">

<configuration>
  <configsections>
  <section name="entityFramework">
  <appsettings>
    <add key="webpages:Version" value="3.0.0.0">
    <add key="webpages:Enabled" value="false">
    <add key="ClientValidationEnabled" value="true">
    <add key="UnobtrusiveJavaScriptEnabled" value="true">
  <system.web>
    <compilation debug="true" targetframework="4.7.2">
    <httpruntime targetframework="4.7.2">
  <runtime>
    <assemblybinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentassembly>
        <assemblyidentity name="System.Web.Helpers" publickeytoken="31bf3856ad364e35">
        <bindingredirect oldversion="1.0.0.0-3.0.0.0" newversion="3.0.0.0">
      <dependentassembly>
        <assemblyidentity name="System.Web.WebPages" publickeytoken="31bf3856ad364e35">
        <bindingredirect oldversion="1.0.0.0-3.0.0.0" newversion="3.0.0.0">
      <dependentassembly>
        <assemblyidentity name="System.Web.Mvc" publickeytoken="31bf3856ad364e35">
        <bindingredirect oldversion="1.0.0.0-5.2.7.0" newversion="5.2.7.0">
  <system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" 
="" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warninglevel="4" compileroptions="/langversion:default /nowarn:1659;1699;1701">
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" 
="" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warninglevel="4" compileroptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+">
  <entityframework>
    <defaultconnectionfactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="mssqllocaldb">
    <providers>
      <provider invariantname="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer">

<p>
    @Html.EJS().Gantt("Gantt").TaskFields(ts =>
ts.Id("Id").Name("Name").StartDate("StartDate").EndDate("EndDate").Duration("Duration")
.Progress("PercentDone").Child("Children").Dependency("Predecessor")).EditSettings(es =>
es.AllowAdding(true).AllowEditing(true).AllowDeleting(true).AllowTaskbarEditing(true)
.ShowDeleteConfirmDialog(true)).Toolbar(new List<string>() 
    { "Add", "Edit", "Update", "Delete", "Cancel", "ExpandAll", "CollapseAll" 
    }).AllowSelection(true).DataSource(ViewBag.datasource).Render()
</p></section></section></section>