All Ajax calls suddenly stopped working with parseerror

[Jaraya]

Hello,

I need some urgent help. I would appreciate if I could get some guidance.

Up until yesterday, our prestashop 1.6.1.11 was working well but suddenly the Ajax calls stopped working.

 

Now we have an issue where search is not auto-suggesting (because it is ajax based), ajax cart throws error, login throws error (in one page checkout), we cannot add/remove products from backend order screen, etc

So in short all the ajax calls have issue of https://trackeasy.fun/usps/

We run the prestashop on google cloud platform. We get following errors:

Ajax cart error: 

Impossible to add the product to the cart. blockcart https://showbox.tools/.
textStatus: 'parsererror'
errorThrown: 'SyntaxError: Unexpected token < in JSON at position 0'
responseText:

Login error: TECHNICAL ERROR: unable to send login informations Details: Error thrown: [object Object] Text status: parsererror.

Edited January 14, 2021 by Jaraya (see edit history)

[musicmaster]

Hard to analyze without seeing the website. 

Enabling debug and looking in the log files is one option.

Try also to remember what your last changes were. Often it is a recently added module that causes problems.

[Prestachamps]

Hmmm..I'm just curious how come that a post from OCt 2019 is re-added as new ? 

I'm not insinuating anything. Still consider this the 8th World Wonder