Undefined variable $activeTab

Im trying to make tabs in a blade component, but I get this error. Any idea why?
<x-filament::tabs label="Content tabs">
    <x-filament::tabs.item
        :active="$activeTab === 'tab1'"
        wire:click="$set('activeTab', 'tab1')"
    >
        Tab 1
    </x-filament::tabs.item>

    <x-filament::tabs.item>
        Tab 2
    </x-filament::tabs.item>

    <x-filament::tabs.item>
        Tab 2
    </x-filament::tabs.item>
</x-filament::tabs>
Solution
Ok, so do you have a public string $activeTab property on your Livewire component?
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