Cannot use with Ember 3.20.2

Hi! I installed Ember Velcro latest version. My Ember app version is 3.20.2. In my template I added, as per documentation, the lines below:

<div id="hook">The `reference` element (the hook)</div>
<div {{velcro "#hook"}}>The `floating` element (the loop)</div>

I get

Uncaught TypeError: Ember._helperManagerCapabilities is not a function

error.

  <Velcro as |velcro|>
  <div {{velcro.hook}}>Velcro hook</div>
  <div {{velcro.loop}}>Velcro loop stuck to Velcro hook!</div>
  {{log "velcro data" velcro.data}}
</Velcro>

I get

velcro.hook is not a valid name for a modifier on line 18.

I tried adding ember modifier in package.json, but nothing changed.

Any ideas why this might be happening? Maybe Ember version is not compatible?

Thanks!

CrowdStrike / ember-velcro

Cannot use with Ember 3.20.2 #153