I am using Prestashop 1.6.1.24 with the default theme bootstrap.
I switched my Standard Delivery to Free Shipping but now when i try to change it back, I get a TECHNICAL ERROR:
Details:
Error thrown: [object Object]
Text status: parsererror
I have checked the JS console as suggested on an old forum thread but it doesn't seem to change regardless of what page of my site I am on and there doesn't seem to be a relevant error.
I've tried clearing the cache but it doesn't make any difference.
I am able to create a new delivery carrier and I can add as many shipping prices and weights as I want but I would have to add this new carrier to every product - over 700 so I can't do that.
Is there something I can do?
Thank you.
Attached are the error code and the js console
