Parsererror when editing a delivery method

[Labite]

Hello, 

I have been trying to solve this problem for over a week now and still, nothing. 

 

I'm using Prestashop 1.6.1.17.

The error I encounter (screenshot) is when trying to EDIT a transportation company.  Note: this error only occours when editing, not creating a delivery method.

But after I create the transportation option, it will not show as an avaliable option when someone tries to checkout and choose that delivery method. 

I am also using a plugin "Shipping cost calculation by the Brazilian Correios Module". The options created by the plugin works fine, but i can't edit other options....

 

Please help me out, I don't know what else to do. 

Link:  http://milacoelho.espaconlineonline.xyz

Error: 

TECHNICAL ERROR: 

Details:
Error thrown: [object Object]
Text status: parsererror

 

Inspect "chrome":

jquery-1.11.0.min.js:4 [Deprecation] Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.

[ArtTechnology]

Hi,

Turn on debug console on PrestaShop and write here errors from console.