error Impossible to add the product to the cart

[Pro]

Hiii
i have some problem with my site , and i think these problems are connected.
If i set quantity to a product i created appear the message parserror sintax error unexpected token
if i try to add to cart an item it give me this error

Impossible to add the product to the cart.
textStatus: 'parsererror'
errorThrown: 'SyntaxError: Unexpected token '

if i try to delete an item from the cart it give me this error

TECHNICAL ERROR: unable to save update quantity Details: Error thrown: [object Object] Text status: parsererror

if i try to register a new account i receive this message

TECHNICAL ERROR: unable to load form. Details: Error thrown: [object Object] Text status: parsererror

i try to disable friendly url but nothing happen

ps version 1.6.0.9

Edited December 19, 2014 by Pro (see edit history)

[PrestaHeroes USA]

make sure you have PrestaShop development mode off, this sometimes causes this issue.

 

config/defines.inc.php

 

define('_PS_MODE_DEV_', false);
 

[Pro]

Yes i ve tried to disable it but nothing change

Edited August 8, 2014 by Pro (see edit history)

[PrestaHeroes USA]

try this

 

back office-->advanced parms-->performance

 

set javascript load top

[Pro]

Tried what you suggest but nothing change :'(

[PrestaHeroes USA]

you may want to consider job offers for someone to take a closer look and debug.