Add/Remove buttons stopped working.

I'm building my first EShop site and everything has been going smoothly, but while working on product Attributes the Add & Remove buttons stopped functioning. The problem exists under Attributes, Discount and Special tabs. The JavaScript console shows this…

When I click the product name…
When I try to Add an Attribute…
However, when I go to Catalog > Options the Option Value Add/Remove buttons work fine.

Hello Howard,
Sound like this is an outstanding issue. Can you please submit a new ticket to EShop category to send me the back-end log-in account to your site so I can help you to resolve the issue?
Hope to hear back from you soon.
Sincerely, Giang

I didn't get a response so I reinstalled EShop and the buttons are working now. I'll open a support ticket if the issue occurs again.

Thanks,
Howard

That's fine Howard!
Have a nice weekend!
Sincerely, Giang

I finally figured out that problem was that one of my attribute names had an apostrophe in it. I removed the punctuation and the buttons seems to be functioning properly.

That is fine Howard!
Sincerely, Giang