chathuJ

in my case it happened because woocommerce didn’t installed some tables. Check woocommerce system status and check woocommerce_order_items table exists.

Hope this would help for someone.

CREATE TABLE IF NOT EXISTS wp_woocommerce_order_items (
order_item_id bigint(20) NOT NULL,
order_item_name longtext NOT NULL,
order_item_type varchar(200) NOT NULL DEFAULT ”,
order_id bigint(20) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

—
— Indexes for dumped tables
—

—
— Indexes for table wp_woocommerce_order_items
—
ALTER TABLE wp_woocommerce_order_items
ADD PRIMARY KEY (order_item_id), ADD KEY order_id (order_id);

—
— AUTO_INCREMENT for dumped tables
—

—
— AUTO_INCREMENT for table wp_woocommerce_order_items
—
ALTER TABLE wp_woocommerce_order_items
MODIFY order_item_id bigint(20) NOT NULL AUTO_INCREMENT;

Hello, I had the same problem. Please refer this and that works for me now,

http://ww.wp.xz.cn/support/topic/number-of-reviews-to-show-doesnt-work