"is not a valid GUID" using createProduct

I didn’t have this issue before… So it seams i broke something some how, but the console log when catching error is giving me this :

Back End :

import wixStoresBackend from 'wix-stores-backend';

export function createProduct(product) {
  return wixStoresBackend.createProduct(product);
}

export function addProductsToCollection(product, collection) {
  return wixStoresBackend.addProductsToCollection(product, collection);
}

export function addProductMedia(product, mediaData) {
  return wixStoresBackend.addProductMedia(product, mediaData);
}

Front End :

import {
    createProduct,
    addProductsToCollection,
    addProductMedia
} from 'backend/products';

import wixData from 'wix-data';
import wixUsers from 'wix-users';
let lenght = 0;

//const NUMBER_OF_CHOICES = $w("#innGallery").items.length;

$w.onReady(function () {
    /*  $w("#addProductButton").onClick(async () => {

      */
})

let galleryPictures = [];
let innGallery = {}

export async function galleryUploadBtn_change(event) {

    let imageToGallery = {};
    let file = $w('#galleryUploadBtn').value;
    if (file.length > 0) {
        const response = await $w('#galleryUploadBtn').startUpload($w('#galleryUploadBtn').buttonLabel = 'Chargement ...');

        if (response) {
            $w('#galleryUploadBtn').buttonLabel = 'Images';
            imageToGallery.src = response.url;
            imageToGallery.type = 'image';
            console.log('gallery', galleryPictures);
            galleryPictures.push(imageToGallery);
            imageToGallery = {};
        }
    }
    galleryDisplayer();
}

function galleryDisplayer() {
    $w('#innGallery').items = galleryPictures;
    $w('#Gallery').expand();
}

export async function videoUploadBtn_change(event) {
    let videoToGallery = {};
    let file = $w('#videoUploadBtn').value;
    if (file.length > 0) {
        const response = await $w('#videoUploadBtn').startUpload($w('#videoUploadBtn').buttonLabel = 'Chargement ...');

        if (response) {
            $w('#videoUploadBtn').buttonLabel = 'Videos';
            videoToGallery.src = response.url;
            videoToGallery.type = 'video';
            console.log('gallery', galleryPictures);
            galleryPictures.push(videoToGallery);
            videoToGallery = {};
        }
    }
    galleryDisplayer();
}

export function clear_click(event) {
    galleryPictures = [];
    galleryDisplayer();
}

/**
*   Adds an event handler that runs when an input element's value
 is changed.
*    @param {$w.Event} event
*/

/**
*   Adds an event handler that runs when an input element's value
 is changed.
*    @param {$w.Event} event
*/

/**
 *  Adds an event handler that runs when the element is clicked.
 *   @param {$w.MouseEvent} event
 */
//import { createProduct } from 'backend/products';

// ...

/**
 *  Adds an event handler that runs when the element is clicked.
 *   @param {$w.MouseEvent} event
 */
export async function addProductButton_click(event) {

    wixData.query('Stores/Products').find().then((results) => {
        lenght = results.items.length
    })

    var product = {
        "name": $w("#input1").value,
        "description": $w("#textBox1").value,
        "price": $w("#input2").value,
      "sku": wixUsers.currentUser.id + "-" + Number(lenght + 1),

        
        "productType": "physical"
    }

    if ($w("#checkbox1").checked === true) {
        product = { "name": $w("#input1").value,
        "description": $w("#textBox1").value,
        "price": $w("#input2").value,
      "sku": wixUsers.currentUser.id + "-" + Number(lenght + 1),

        "productOptions": {
            "Variante": {
                "choices": [{
                    "description": $w("#input3").value,
                    "value": $w("#input3").value
                }]
            }
        },   
        "manageVariants": true,
        "productType": "physical"}
    }
    console.log(product)
    try {

        let newProduct = await createProduct(product);
        console.log(product)

        // The product was created. Now assign it
        // to a collection. Convert the product ID
        // to an array.
        const newProducts = [newProduct._id];
        
        const collectionId = [$w("#dropdown1").value, $w("#dropdown3").value]

        await addProductsToCollection(collectionId, newProducts)

        // The product was assigned to a collection.
        // Now let's add media.
        const option = $w("#dropdown2").value
        const choice = $w("#input3").value

        innGallery = galleryPictures.map(a => ({ src: a.src }))
        const medias = innGallery

        const mediaData = medias

        // If a choice and option are defined,const NUMBER_OF_CHOICES = 4;
        // addProductMedia() adds media to choice
        /* if (choice !== "" && option !== "") {
            mediaData[0].choice = {
                choice,
                option
            }
        }
*/
        await addProductMedia(newProducts, mediaData);
    } catch (err) {
        console.log(err)
    }

}

/**
*   Adds an event handler that runs when an input element's value
 is changed.
*    @param {$w.Event} event
*/
export function checkbox1_change(event) {
    if ($w('#checkbox1').checked === true) {
        $w("#input3").expand()
        $w("#dropdown2").expand()
        $w("#uploadButton1").expand()
    } else {
        $w("#input3").expand()
        $w("#dropdown2").collapse()
        $w("#uploadButton1").collapse()

    }
}

Any idea ?