hello! when I validated the practical challenge below, this warning appeared "On the 'Kids Campaign' custom button, we couldn't find the URL for the Create Kids Campaign flow. Does anyone know what it could be?

Run a Flow from a Custom Button

Create a custom button and a Lightning record page to run the Create Child Campaign flow.

If you haven’t already completed the challenge in unit 2 (Build an Autolaunched Flow), do that now. Otherwise, you won't be able to complete this challenge.

• On the Campaign object, create a custom button:
  • Label: Child Campaign
  • Name: Child_Campaign
  • Display Type: Detail Page Button
  • Behavior: Display in existing window without sidebar or header
  • Text: Enter a relative URL using the Create Child Campaign flow’s URL and these parameters in this order:
    • Set campID to the Campaign ID merge field
    • Set campName to the Campaign Name merge field
    • Set campOwner to the Owner ID merge field
    • Set campStartDate to the Start Date merge field (set the variable to be equal to

• • • {!TEXT(Campaign.StartDate)} to format the date correctly)
    • Set retURL to the Campaign ID merge field
• On the Campaign object, create a Lightning Record Page:
  • Label: Campaign Lightning Page
  • Page layout: clone the Campaign Grouped View Default (we won’t check this, but it ensures that you don’t start with a blank page)
• Upgrade the Highlights Panel to Dynamic Actions:
  • Select Migrate
  • Source: Campaign Layout
• Add the Child Campaign action
• Save and activate the Lightning page.
  • Activation: Assign as org default
  • Assign form factor: Desktop (we won’t check this)