Support » Plugin: WooCommerce » What does this mean? and how would i fix this?

  • What does this mean..

    Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘woocommerce_price_filter’ not found or invalid function name in /home/npssanda/public_html/wp-includes/plugin.php on line 199

    Warning: array_unique() expects parameter 1 to be array, null given in /home/npssanda/public_html/wp-content/plugins/woocommerce/includes/class-wc-query.php on line 353

    https://wordpress.org/plugins/woocommerce/

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