Order status not working

I am unable to edit order status. The drop down list has no items

Check the screenshot here
https://www.diigo.com/item/image/4tu73/n9rv

I disabled all the plugins, deactivated & activated wooCommerce plugin but still the problem doesn’t get solve.

WooCommerce version: 2.1.11

Not sure what caused it and how to fix it?

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