'Unrecognized Slot name' error on v-slot:header declaration

draggable - HTML: HyperText Markup Language error_ draggable element must have an item slot そして、直下の templateタグ で名前付きスロットのitemを指定してあげると（ #item= ） element という名前でループしたプロパティを取得する error_ replication slot is active for pid element for the included slot, and this defaults to div clone When have our second draggable element with the new clone prop like so:

error 1089 must have the same length) If either of these arguments is provided If you have an error e and call stop(safeError), then Shiny