Call a Flow from a Custom Button

Hello Trailblazers,

I want to send a flow when a custom button is clicked on a case record. I am getting the attached error message when I click the close button. I think the button URL is the issue

The flow is active

The flow is named [FLOW] Case Clsure Email

The CaseId variable is VarT_CaseID

Where am I going wrong?

Thanks Trailblazers

#Flow  #Custom URL Button