Expandable box gives junk

Though the attributes display properly next to the image, at the bottom whe I expand the the additional info button, I get junk.

Check link – https://www.beta.canvaslane.com/product/testray/

Warning: call_user_func() expects parameter 1 to be a valid callback, no array or string given in /home4/srishtim/public_html/canvaslane.com/beta/wp-content/themes/Extra/includes/woocommerce-support.php on line 180

This happened only when I enabled the widget

https://www.ads-software.com/plugins/woocommerce-show-attributes/