Conflict between plug-ins

My site needs a form with the signature option. I installed Gravity Forms Signature Add on, and it works fine when The Grid from Theme-One (https://codecanyon.net/item/the-grid-responsive-wordpress-grid-plugin/13306812) is deactivated. As soon as I activate the plug in the signature option doesn’t write on the field. I really like the grid option since my front page design depends on your plug in.

Error on inspector: Uncaught TypeError: $ is not a function? In file: ss.js

Is there something I can do to fix this issue and keep both plug ins working together?

Thanks

https://wordpress.org/plugins/gravity-signature-forms-add-on/