DButton이 더 이상 문자열 형태의 @action을 지원하지 않습니다. 대신 클로저 action을 사용하도록 리팩터링해 주세요

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You can find detailed information about modern Ember actions here: Component State and Actions - Components - Ember Guides

But essentially, the message you’re seeing means that you need to change something like

{{d-button action="blah"}}

to something like:

{{d-button action=(action "blah")}}

If you can share a link or snippet of your code, I’m sure we can help out with some more specific instructions