Sorry, something went wrong

The control type 'System.Web.UI.WebControls.RegularExpressionValidator' is not allowed on this page. The type System.Web.UI.WebControls.RegularExpressionValidator, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a could not be found or it is not registered as safe.