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All Ajax calls suddenly stopped working with parseerror

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

Up until yesterday, our prestashop 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


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

Ajax cart error: 

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


Login error:

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


Appreciate the guidance

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