Create product programmatically, addImageToMediaGallery throws exception (v2.1.0)

[cizgidekiadam]

Steps to reproduce

1. Install Magento with composer create-project
2. Create custom script for create sample product.
3. All images in pub/media/jpg folder
4. Code:

$product = $objectManager->create(Magento\Catalog\Model\Product::class);
   $product->setTypeId(Type::TYPE_SIMPLE)
   ->setAttributeSetId($attributeSetId)
   ->setWebsiteIds([1])
   ->setName($name)
   ->setSku($sku)
   ->setPrice(100)
   ->setStatus(Status::STATUS_ENABLED)
   ->setStockData(['use_config_manage_stock' => 1, 'qty' => 100, 'is_qty_decimal' => 0, 'is_in_stock' => 1]);
   $imagePath = "jpg/SKU.jpg";
   $product->addImageToMediaGallery($imagePath, array('image', 'small_image', 'thumbnail'), false, false);
   $productRepository->save($product);

Expected result

1. Product with image and a cup of coffee 😒

Actual result

Uncaught exception 'Magento\Framework\Exception\LocalizedException' with message 'There is no MediaGalleryEntryConverter for given type' in vendor/magento/module-catalog/Model/Product/Attribute/Backend/Media/EntryConverterPool.php:48

[cizgidekiadam]

It seems exception throws when a saved product object not exists. Save product once before add images, then add images and re-save same object fixed that issue.

$product->setTypeId(Configurable::TYPE_CODE)
    ->setAttributeSetId($attributeSetId)
    ->setWebsiteIds([1])
    ->setName($p["name"])
    ->setSku($p["sku"])
    ->setVisibility(Visibility::VISIBILITY_BOTH)
    ->setStatus(($p["status"]==1?Status::STATUS_ENABLED:Status::STATUS_DISABLED))
    ->setStockData(['use_config_manage_stock' => 1, 'is_in_stock' => 1]);
$product=$productRepository->save($product);
$imagePath = "jpgs/".$p["sku"].".jpg"; // path of the image
$product->addImageToMediaGallery($imagePath, array('image', 'small_image', 'thumbnail'), false, false);
$product->save();

[magento-engcom-team]

@rbostan, thank you for your report.
We've created internal ticket(s) MAGETWO-84698 to track progress on the issue.