error when someone trying to add a product in basket cart

[pfousianis]

good morning

yesterday morning my site www.fousianis.gr gives this error to everyone which trying to add a product i have presta 1.6

 

 

Impossible to add the product to the cart.
textStatus: 'parsererror'
errorThrown: 'SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data'
responseText:
{"products":[{"id":1050,"link":"http:\/\/www.fousianis.gr\/\u03c0\u03b1\u03bd\u03b5\u03c3-\u03b5\u03bd\u03b7\u03bb\u03b9\u03ba\u03c9\u03bd\/1050-\u03b2\u03c1\u03b1\u03ba\u03b1\u03ba\u03b9-\u03c4\u03b5\u03bd\u03b1-large.html","quantity":1,"image":"http:\/\/www.fousianis.gr\/88-home_default\/\u03b2\u03c1\u03b1\u03ba\u03b1\u03ba\u03b9-\u03c4\u03b5\u03bd\u03b1-large.jpg","image_cart":"http:\/\/www.fousianis.gr\/88-cart_default\/\u03b2\u03c1\u03b1\u03ba\u03b1\u03ba\u03b9-\u03c4\u03b5\u03bd\u03b1-large.jpg","priceByLine":"13,91 \u20ac","name":"\u0392\u03a1\u0391\u039a\u0391\u039a\u0399 \u03a4\u0395\u039d\u0391 LARGE","price":"13,91 \u20ac","price_float":11.21,"idCombination":0,"idAddressDelivery":0,"is_gift":false,"hasAttributes":false,"hasCustomizedDatas":false,"customizedDatas":[]},{"id":373,"link":"http:\/\/www.fousianis.gr\/\u03c0\u03b1\u03bd\u03b5\u03c3-\u03b5\u03bd\u03b7\u03bb\u03b9\u03ba\u03c9\u03bd\/373-\u03c0\u03b1\u03bd\u03b5\u03c3-flufsan-large-x-10.html","quantity":1,"image":"http:\/\/www.fousianis.gr\/27-home_default\/\u03c0\u03b1\u03bd\u03b5\u03c3-flufsan-large-x-10.jpg","image_cart":"http:\/\/www.fousianis.gr\/27-cart_default\/\u03c0\u03b1\u03bd\u03b5\u03c3-flufsan-large-x-10.jpg","priceByLine":"7,36 \u20ac","name":"\u03a0\u0391\u039d\u0395\u03a3 FLUFSAN LARGE X 10","price":"7,36 \u20ac","price_float":5.93,"idCombination":0,"idAddressDelivery":0,"is_gift":false,"hasAttributes":false,"hasCustomizedDatas":false,"customizedDatas":[]}],"discounts":[{"id":1,"name":"\u03c4\u03b9\u03bc\u03bf\u03ba\u03b1\u03c4\u03b1\u03bb\u03bf\u03b3\u03bf\u03c2","description":"\u03c4\u03b9\u03bc\u03bf\u03ba\u03b1\u03c4\u03b1\u03bb\u03bf\u03b3\u03bf\u03c2","nameDescription":"\u03c4\u03b9\u03bc\u03bf\u03ba\u03b1\u03c4\u03b1\u03bb\u03bf\u03b3\u03bf\u03c2 :...","code":"","link":"http:\/\/www.fousianis.gr\/\u03a0\u03b1\u03c1\u03b1\u03b3\u03b3\u03b5\u03bb\u03af\u03b1?deleteDiscount=1","price":"0,00 \u20ac","price_float":0}],"shippingCost":"0,00 \u20ac","shippingCostFloat":0,"taxCost":"4,13 \u20ac","wrappingCost":"0,00 \u20ac","nbTotalProducts":2,"total":"21,27 \u20ac","productTotal":"21,27 \u20ac","freeShipping":"0,00 \u20ac","freeShippingFloat":0,"free_ship":false,"isVirtualCart":false,"hasError":false,"crossSelling":""}

 

 

 

if i reload the page product is added in basket but if i am trying to delete show me a message error i can't delete  i must reload the page in order to delete