Actually we are having trouble in understanding your query . Please mention the plugin that you are activating display a set of posts . Also please share your site URL so it would be easier for us to inspect further .
Thanks for the quick response.
I am not trying to activate a plugin. I just simply want to display a list of posts by category on a page.
So on the page called cars. I want to list all the posts with the category cars. Simple.
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