Woocommerce Variable Product is not adding into Cart

Hi all,

Need help in Woocommerce, as I setup a variable product by creating its atribute after that when I check it on the site its not adding to cart.

I did update my Woocommerce version to the latest one but still facing the same problem:
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Problem Details:
“Your theme has bundled outdated copies of WooCommerce template files – if you encounter functionality issues on the fronted this could the reason. Ensure you update or remove them (in general we recommend only bundling the template files you actually need to customize). See the system report for full details.”
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Woocommerce system stats showing this:

Templates
Template Overrides (WooCommerce): archive-product.php version 1.6.4 is out of date. The core version is 2.0.0,
content-product.php,
content-product_cat.php,
content-single-product.php,
add-to-cart.php version 1.6.4 is out of date. The core version is 2.1.0,
rating.php,
variable.php version 2.0.3 is out of date. The core version is 2.1.0,
single-product-reviews.php version 1.6.4 is out of date. The core version is 2.1.0,
single-product.php,
taxonomy-product_cat.php,
taxonomy-product_tag.php
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Some more info:
WC Version: 2.1.5
WC Database Version: 2.1.5
WP Version: 3.8.1