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

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If you don't add a slot attribute to the content you pass to your component, it will go in the default slot Using both default and named slots,

Commonly used first names This slot type recognizes formal names, informal nicknames, and names consisting of more than one word The name sent to your How to set the name prop of slot when using v-slot in loop?

lucky mr green slot Description This widget allows you to expose an external slot for your User Widget that can be populated with any other widgets and is useful for creating Named Slots: Slots can be named, allowing the parent to inject content into specific placeholders within the child component Dynamic Slot Names