Cannot create WorkflowEventBinding with customized workflow Meta-Data

[sinorch]

In Webhooks additional exercise I couldnt create the workfloweventbinding following the documentation:

apiVersion: argoproj.io/v1alpha1 kind: WorkflowEventBinding metadata: name: hello spec: event: selector: payload.message != "" submit: metadata: name: '{{event.payload.message}}-world' annotations: anAnnotation: '{{event.payload.message}}' labels: testlabel: gt workflowTemplateRef: name: hello arguments: parameters: - name: message valueFrom: event: payload.message

controlplane:~$ kubectl apply -f hello-workfloweventbinding.yaml 
Error from server (BadRequest): error when creating "hello-workfloweventbinding.yaml": WorkflowEventBinding in version "v1alpha1" cannot be handled as a WorkflowEventBinding: strict decoding error: unknown field "spec.submit.metadata.annotations", unknown field "spec.submit.metadata.labels", unknown field "spec.submit.metadata.name"

controlplane:~$ kubectl explain workfloweventbinding.spec.submit.metadata
GROUP:      argoproj.io
KIND:       WorkflowEventBinding
VERSION:    v1alpha1

FIELD: metadata <Object>


DESCRIPTION:
    <empty>

On the documentation, I checked these parts:

• https://argo-workflows.readthedocs.io/en/latest/events/#customizing-the-workflow-meta-data
• https://argo-workflows.readthedocs.io/en/latest/fields/#workfloweventbindingspec

Can you help me for this exercise?