'My callback has been called'

I am trying to get this to work in section 6. I can make the service and see it on the rosservice list command. When I try to call it, nothing appears (where I would expect it to say My callback has been called), just blinking cursor. Any reason this could be happening?

HI @r.franklinismail would you show your script or a screenshot so we can have a better look?

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