HI guys this getdms var cant read it it saying
Severity Code Description Project File Line Suppression State Details

public class MaskElementDialog : Dialog
{
private readonly Label helloPapi;
private readonly Label elemPapi;
public MaskElementDialog(IEngine engine) : base(engine)
{
helloPapi = new Label($"Hi {engine.UserDisplayName} please select an elment to mask");
elemPapi = new Label("Eelemtn");
var getdms = engine.GetDms();
EelemntDropdown = new DropDown();
}

Error (active) CS1061 'IEngine' does not contain a definition for 'GetDms' and no accessible extension method 'GetDms' accepting a first argument of type 'IEngine' could be found (are you missing a using directive or an assembly reference?)

how to set it properly