Error counting Children Completed tasks referring another sheet


I have a Summary sheet to have all counts of my sheets.

I am trying to use this function: =COUNTIF(CHILDREN({Product Release Roadmap Intervalo 3}); "Complete") to have the count of the completed children tasks in anothet sheet named "Product Release Roadmap"

but it is returning "Unsupported crossheet formula"

Can you help me?



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