TheVault

I’m using Woot and had the same error.

go to

wp-content/themes/storefront/inc/storefront-functions.php

Change;

function is_woocommerce_activated() {
	return class_exists( 'woocommerce' ) ? true : false;
}

to

if ( ! function_exists( 'is_woocommerce_activated' ) ) {
	function is_woocommerce_activated() {
		return class_exists( 'woocommerce' ) ? true : false;
	}
}

There were other things broken with Woot so I would recommend just rolling back like I did, but this gives a quick fix (Which is NOT a permanent or long-term solution)