Problem when I try to create configurable product

<?php 
$options = array(
    'trace' => true,
    'connection_timeout' => 86400,
    'wsdl_cache' => WSDL_CACHE_NONE,
);

$proxy = new SoapClient('https://www.veromotos.com.br/index.php/api/v2_soap/?wsdl=1',$options);

try { 
echo "<pre>";
    $sessionId = $proxy->login('example', 'example123@');
echo "</pre>";
}catch(Exception $e) {
    die(var_dump($e));
}

/**
 * Simple product #1 (sku : SKU-001)
 */
$productData = array(
    'name' => 'Produto Simples #1',
    'description' => 'Descrição do Produto Simples #1',
    'short_description' => 'Descrição Curta do Produto Simples #1',
    'website_ids' => array('base'), // Id or code of website
    'status' => 1, // 1 = Enabled, 2 = Disabled
    'visibility' => 1, // 1 = Not visible, 2 = Catalog, 3 = Search, 4 = Catalog/Search
    'tax_class_id' => 2, // Default VAT
    'weight' => 0, 
    'stock_data' => array(
        'use_config_manage_stock' => 0,
        'manage_stock' => 0, // We do not manage stock, for example
    ),
    'price' => 9.90, // Same price than configurable product, no price change
    'additional_attributes' => array(
        'single_data' => array(
            array(
                'key'   => 'cores',
                'value' => 'AMARELO', // Id or label of color, attribute that will be used to configure product
            ),
        ),
    ),
);

$proxy->catalogProductCreate($sessionId, 'simple', 'Default', 'SKU-001', $productData);

/**
 * Simple product #2 (sku : SKU-002)
 */
$productData = array(
    'name' => 'Produto Simples #2',
    'description' => 'Descrição do Produto Simples #2',
    'short_description' => 'Descrição Curta do Produto Simples #2',
    'website_ids' => array('base'), // Id or code of website
    'status' => 1, // 1 = Enabled, 2 = Disabled
    'visibility' => 1, // 1 = Not visible, 2 = Catalog, 3 = Search, 4 = Catalog/Search
    'tax_class_id' => 2, // Default VAT
    'weight' => 0,
    'stock_data' => array(
        'use_config_manage_stock' => 0,
        'manage_stock' => 0, // We do not manage stock, for example
    ),
    'price' => 8.90, // Red product is $1 less than configurable product
    'additional_attributes' => array(
        'single_data' => array(
            array(
                'key'   => 'cores',
                'value' => 'AZUL', // Id or label of color, attribute that will be used to configure product
            ),
        ),
    ),
);

// Creation of product #2
$proxy->catalogProductCreate($sessionId, 'simple', 'Default', 'SKU-002', $productData);

/**
 * Configurable product
 */
$productData = array(
    'name' => 'Produto Configurável',
    'description' => 'Descrição do produto configurável',
    'short_description' => 'Descrição curta do produto configurável',
    'website_ids' => array('base'), // Id or code of website
    'status' => 1, // 1 = Enabled, 2 = Disabled
    'visibility' => 4, // 1 = Not visible, 2 = Catalog, 3 = Search, 4 = Catalog/Search
    'tax_class_id' => 2, // Default VAT
    'weight' => 0,
    'stock_data' => array( 
        'use_config_manage_stock' => 0,
        'manage_stock' => 0, // We do not manage stock, for example
    ),
    'price' => 9.90,
    'associated_skus' => array('SKU-001', 'SKU-002'), // Simple products to associate
);
try {
$proxy->catalogProductCreate($sessionId,'configurable','Default','Configurable Product',$productData);

}catch(Exception $e) {
    echo "<pre>";
    die(var_dump($e));
    echo "</pre>"; 
}

I'm receiving the following error:

["previous":"Exception":private]=>
  NULL
  ["faultstring"]=>
  string(92) "Call to undefined method Mage_Catalog_Model_Product_Attribute_Backend_Price::getAllOptions()"
  ["faultcode"]=>
  string(15) "SOAP-ENV:Server"
}

jreinke / magento-improve-api

Problem when I try to create configurable product #19