getting error There is no ViewData item of type 'IEnumerab

Question

 After clicking on create button without selecting any data  i got an error 

 

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'CostCenterId'."}

 

this my contrller action  method

public ActionResult Create()

{

ViewBag.Currency = new SelectList(db.Currencys, "Id", "Currency");

ViewBag.CostCenterId = new SelectList(db.CostCenterIds, "Cost_Center_Id", "Cost_Center_Name");

return View();

}

 

 

<tr>

<td>

@Html.LabelFor(model => model.CostCenterId)

</td>

<td>

@Html.DropDownListFor(model => model.CostCenterId, (SelectList)ViewBag.CostCenterId, "Select ", new { style = "width:200px" })

@Html.ValidationMessageFor(model => model.CostCenterId)

</td>

</tr>

<tr>

<td>

@Html.LabelFor(model => model.Currency)

</td>

<td>

@Html.DropDownListFor(model => model.Currency, (SelectList)ViewBag.Currency, "Select ", new { style = "width:200px" })

@Html.ValidationMessageFor(model => model.Currency)

</td>

</tr>