Activating Yoast breadcrumbs causes “incorrect value type @id” error on Google

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When I activate the yoast breadcrumbs, I get the following error on google search console and on structured data testing tool.

Structured data with syntax errors detected
Invalid items are not eligible for Google Search's rich results

incorrect value type @id

And Console highlighted this part on my website
{"@type":"WebPage","@id":false,"url":false,"name":"Event Planning"}

What is the cause of this?

Kind regards,
Sadiq