Passing values through a Skill User Form

 Hi,

I am trying to create a form accesible with a menu in Virtuoso Layout editor to create a complex shape. Managed to add the menu, couple of menu items and create a form using material in this forum and web but struggling to pass the values input through the form to a procedure. I am trying to draw a donutas a start.

My code is copied below and appriciate anyone can help figuring out the problem.

The error  message is

*Error* dbCreateDonut argument #4 should be a number (type template = "dglnn") - nil

procedure(CreateAddDoForm()
     let((InnerRadius OuterRadius Centre Layer)
        InnerRadius=hiCreateIntField(
                ?name 'InnerRadius
                ?prompt "Inner Radius"
                )
    OuterRadius=hiCreateIntField(
                ?name 'OuterRadius
                ?prompt "Outer Radius"
                )
    Centre=hiCreateIntField(
                ?name 'Centre
                ?prompt "Centre"
                )
        Layer=hiCreateIntField(
                ?name 'Layer
                ?prompt "Layer"
                )
               
        hiCreateAppForm(
            ?name 'AddDonutForm
            ?formTitle "Input Source Parameters"
            ?buttonLayout 'OKCancelApply
            ?callback "DrawDonut()"
            ?fields
                list(
                    list(InnerRadius 0:0 200:30 100)
                    list(OuterRadius 0:35 200:30 100)
                    list(Centre 0:70 200:30 100)
                    list(Layer 0:105 200:30 100)
                    )
                      )
         );let
      );procedure

procedure(FunctionAddDonut()
     unless(boundp('AddDonutForm)
        CreateAddDoForm()
           )
  
     hiDisplayForm(AddDonutForm)
         )

procedure(DrawDonut()
      let( (Orad Irad)
        Orad=AddDonutForm->OuterRadius->Value
        Irad=AddDonutForm->InnerRadius->Value
        cvID=geGetWindowCellView()
        dbCreateDonut(cvID "DIFF"  0:0 Orad Irad)
       
       )

      )