Woocommerce Version 3.3.1 - Released 2018-02-06  is not compatible with Salient Theme Version 8.5.3  . 

Kindly do not Update Woocommerce and Downgrade if you have done so until a Salient Theme Update is released .

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Mailchimp Integration

Please see Resource link : https://mycyberuniverse.com/mailchimp-subscriber-popup-not-working-in-wordpress.html .