Error when checkout: Error in processing payment

I’m using the last version of woocommerce and Mercado pago plugin. I keep getting this message when i want to checkout from cart. I attach to images so you can see the issue. I’m not getting any error in console and this what the log says. Of course i am providing zip and address.

The product dimensions i have are 0.20 kg and 15x10x15 cm

05-08-2017 @ 18:37:11 - [create_url] - mercado pago gave error, payment creation failed with error: shipments.dimensions invalid
05-08-2017 @ 18:37:11 - [render_order_form] - unable to build Mercado Pago checkout URL.
05-08-2017 @ 18:39:31 - [process_payment] - preparing to render Mercado Pago checkout view.
05-08-2017 @ 18:39:39 - [build_payment_preference] - preference created with following structure: {
    "items": [
        {
            "id": 606,
            "title": "Delantal divertido Rubia x 1, Delantal divertido Tomate x 1",
            "description": "Test",
            "picture_url": "https:\/\/jimenacocinatienda.com\/wp-content\/plugins\/woo-mercado-pago-module\/images\/cart.png",
            "category_id": "art",
            "quantity": 1,
            "unit_price": 9,
            "currency_id": "ARS"
        },
        {
            "id": 607,
            "title": "Delantal divertido Tomate x 1",
            "description": "",
            "picture_url": "https:\/\/jimenacocinatienda.com\/wp-content\/plugins\/woo-mercado-pago-module\/images\/cart.png",
            "category_id": "art",
            "quantity": 1,
            "unit_price": 5,
            "currency_id": "ARS"
        }
    ],
    "payer": {
        "name": "Jimena",
        "surname": "Olleac",
        "email": "[email protected]",
        "phone": {
            "number": "1145287645"
        },
        "address": {
            "street_name": "Testo \/ General Rodriguez B AR",
            "zip_code": "1748"
        }
    },
    "back_urls": {
        "success": "https:\/\/jimenacocinatienda.com\/finalizar-compra\/order-received\/672?key=wc_order_5910e593a39fc",
        "failure": "https:\/\/jimenacocinatienda.com\/carrito\/?cancel_order=true&order=wc_order_5910e593a39fc&order_id=672&redirect&_wpnonce=501b714af5",
        "pending": "https:\/\/jimenacocinatienda.com\/finalizar-compra\/order-received\/672?key=wc_order_5910e593a39fc"
    },
    "shipments": {
        "receiver_address": {
            "zip_code": "1748",
            "street_name": "Testo General Rodriguez B AR",
            "apartment": ""
        },
        "mode": "me2",
        "dimensions": null,
        "default_shipping_method": 0,
        "free_methods": []
    },
    "payment_methods": {
        "installments": 24,
        "default_installments": 1
    },
    "external_reference": "Jimenacocina Tienda672",
    "notification_url": "https:\/\/jimenacocinatienda.com\/wc-api\/WC_WooMercadoPago_Gateway\/",
    "sponsor_id": 208682286,
    "auto_return": "approved"
}
05-08-2017 @ 18:39:41 - [create_url] - mercado pago gave error, payment creation failed with error: shipments.dimensions invalid
05-08-2017 @ 18:39:41 - [render_order_form] - unable to build Mercado Pago checkout URL.