ionic4自定義組件報錯'ion-' is not a known element:

項目要把頂部返回按鈕抽成單個組件，因而使用ionic g component xx/xx/back 生成了組件文件 back.component.html中使用了ion-buttonshtml <ion-buttons slot="start"> <ion-back-button text="返回" color="dark" icon="arrow-back"> </ion-back-bu

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