Tell us what you are trying to do? I updated the WPML multilanguage plugin (after it shut down after an expired key of the webhost. I purchased a new key on my own account) Now my webshop gives an "SyntaxError: JSON.parse Error: Invalid character at position:1" when you go to check-out!
In the woocommerce invoice page I see that it is a Multilanguage problem.
IExample see attachments
What is the link to your site? hidden link AND hidden link (same)
I deleted the mango table rate plugin and installed a new one that is compattible. But no luck. I got the same issue. I found https://wpml.org/forums/topic/fatal-error-in-woocommerce-order-overview/ thread, but ALL plugins are up-to-date.
My wordpress version is 4.5.4, which woocommerce does not support. So I am empting to upgrade now. Not sure if that is wise..but will backup all and turn plugins off before upgrading.