getting error in mvc dropdown

I am getting error "System.InvalidOperationException: 'There is no ViewData item of type 'IEnumerable' that has the key 'ddlweb'. "

public ActionResult GetWebVersions()

{

ViewBag.ddlwebversion = MS.GetWebVersion();

return View("Version");

}

public dynamic GetWebVersion()

{

using (LystenEntities db = new LystenEntities())

{

//var weblist = db.WebVersions.Where(x => x.Status == "Current").OrderBy(x => x.Id).ToList();

return new SelectList(db.WebVersions.OrderBy(x => x.Id).ToList(), "Id", "Version");

}

Category Name

@*@Html.DropDownList("ddlwebversion", (SelectList)ViewBag.ddlwebversion, "--- Select ---", new { @class = "form-control " })*@

@Html.DropDownList("ddlwebversion", (IEnumerable)ViewBag.ddlwebversion, "----Select---", new { @class = "form-control " })

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