My client was using the Prestashop 1.6 and and getting the authentication error when his visitor wants to create an account. Site is giving the following error:
TECHNICAL ERROR: unable to load form. Details: Error thrown: [object Object] Text status: parsererror
If your friendly URL option is turn on at backend, sometimes this kind of error is generating. I resolved the issue by editing the authentications.js file. I replaced url: baseUri to url: baseUri + ‘index.php?controller=authentication’ and it is made the trick. Error is gone and visitor can create the account now.