While I tried to add a new product to My Wordpress Woocommerce site. The Product data -> attributes section shows a loading icon and not allowing to add new Attributes to the page. 
Because of this issue I updated the Wordpress and Woocommerce to new version. Also I tried to deactivate some plugin. Nothing works. I installed the following plugins in My Wordpress site.
- Booster for WooCommerce
- Contact Form 7
- Envato WordPress Toolkit
- Google Analytics Counter Tracker
- Header and Footer Scripts
- Jetpack by WordPress.com
- Nancy Shortcodes
- WPBakery Visual Composer
