investigating jquery conflicts

Hi,
I am working on a site that uses a Rocket Theme template, and this seems to cause a jquery issue when adding products to the cart.
People get the error message 'internal server error' in the popup message.
In Google chrome developer tools, I get the error "jquery.min.js?ce2ad18…:4 POST threadbear.com.au/index.php?option=com_eshop&task=cart.add 500 (Internal Server Error)"
How would you suggest I fix this issue?

Hello Enoch,

Please submit a new ticket so our support staff will help you to check.

Sincerely, Giang

I'm having the same problem with jquery conflicts
Why not tell us what happened and how it was resolved?

Hello Halcer,

I need to access to your site to check and find the exact reason of issue. Please submit a new ticket and send me the super admin account to your site so I can help you.

Hope to receive the ticket from you soon.

Sincerely, Giang