As of March 2nd, 2020, the Instagram platform will be deprecating its API. This will directly affect the Instagram feed section in all WordPress & Shopify themes. Read more on how it affects your theme here: https://fuelthemes.net/important-notice-instagram-feed-removal/

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This is an error generated by the Revolution Slider. You can import the demo sliders, which are given separately with your ThemeForest download. If you do not want to import the demo sliders, you can go to edit Page, and inside Page metaboxes, change the Revolution Slider field.