Expression evaluation error has parameters, but instead passed 0 parameters

I have this issue in tempo:
Expression evaluation error at function rule!Confirmation_Interface: Rule 'confirmation_interface' has 1 parameters, but instead passed 0 parameters.
Do you know what i'm doing wrong?
to be honest i'm not familiar with programming

=load(
  local!test: 'type!{http://www.appian.com/ae/types/2009}LabelValue'(),
  local!currentStep: 1,
  local!steps: {"Step 1", "Step 2", "Confirmation"},
  a!formLayout(
    label: "Confirmation Interface",
    instructions: "123",
    contents: {
      a!milestoneField(
        steps: local!steps,
        active: local!currentStep
      ),
      a!sectionLayout(
        contents: {
          a!textField(
            label: "Label",
            value: local!test.label,
            saveInto: local!test.label,
            required: local!currentStep <> length(local!steps),
            readOnly: local!currentStep = length(local!steps)
          )
        },
        showWhen: or(local!currentStep = 1, local!currentStep = length(local!steps))
      ),
      a!sectionLayout(
        contents: {
          a!textField(
            label: "Value",
            value: local!test.value,
            saveInto: local!test.value,
            required: local!currentStep <> length(local!steps),
            readOnly: local!currentStep = length(local!steps)
          )
        },
        showWhen: or(local!currentStep = 2, local!currentStep = length(local!steps))
      )
    },
    buttons: a!buttonLayout(
      primaryButtons: {
        a!buttonWidgetSubmit(
          label: "Done",
          showWhen: local!currentStep = length(local!steps),
          style: "PRIMARY"
        ),
        a!buttonWidget(
          label: "Next",
          value: local!currentStep + 1,
          saveInto: {
            local!currentStep
          },
          showWhen: local!currentStep <> length(local!steps),
          style: "PRIMARY",
          validate: true
        )
      },
      secondaryButtons: {
        a!buttonWidget(
          label: "Go Back",
          value: local!currentStep - 1,
          saveInto: local!currentStep,
          showWhen: local!currentStep > 1
        ),
        a!buttonWidgetSubmit(
          label: "Cancel",
          value: true,
          saveInto: ri!cancel,
          style: "LINK",
          skipValidation: true
        )
      }
    )
  )
)