This is most likely from Woocommerce. If you have installed the plugin and not finished the basic setup for Woocommerce, or if the shop looses connection with the shop page then your content will not show. Two fixes, finish the setup for Woocommerce or go to Woocommerce > Settings > Products > Display make sure that the shop page is assigned. Or you can deactivate the plugin until you are ready to use it.
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