You will receive the warning:
Warning: number_format() expects parameter 1 to be double, string given in /home/shopdemo/public_html/wp-content/plugins/Extensionworks-WC-Framework/classes/class-shipper.php on line 1176
Shipping classes are not programmed to work with our shipping plugins, please remove any shipping classes you may have set up in your product configuration.
Please use the setting in the example provided:
We have an article about WooCommerce Shipping Classes found here: WooCommerce Shipping Classes