Yandex.Market XML

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.4.36
-- Browser(s) name and version -- : Mozilla/5.0

Good day. I installed the component for export of goods Yandex.Market XML. The problem is this:
1. Component in the formation of price displays the following error:

Product id=1 name="Canon XEED WX450ST" error. Price not set.

Product id=4 name="Canon XEED WX520" error. Price not set.

Product id=5 name="Canon XEED WUX400ST" error. Price not set.
and so with all the goods. I realized that a component does not find the price of the goods. why?

2. After installation there was a message:

The GD library for thumbnails creation is installed and activated on your website. However, it is not configured to support images. Please make sure that you're using a valid image extension and contact your hosting company or system administrator in order to make sure that the GD library on your web server supports the image extension

What to do?

Hello,
Note that if your error messages are coming from the "Yandex.Market XML" component, you should directly ask them about it so that they can directly you.

1. Where are you having these error messages ?

2. After installing which extension ?