Veevalidate 'required_if:' Rule

I have used syntax rule required_if from docs: vee-validate required_if rule and it doesn't work. Can someone point me to the right direction? I need this simple required_if rule t

Solution 1:

@Randy Casburn pointed me right - thanks man!

The trouble was with versions. I got it working under this example: my codesandbox

Hope it helps somebody ;-)