如何在我的Woocommerce结帐页面修复我的国家选择器？

I am currently making my own checkout-page for a client, and i want to intergrate the country selector. I have been looking through i for hours, and cant seem to figure out what is wrong.

Woocommerce just comes up with the message: Billing Country is a required field. Please enter an address to continue.

I tried to delete some class', some code here and there. But cant seem to figure out what is wrong!

What am i missing?

I have tried to just have an Input-field where the costumer can write DK, GB US and so one. IT works, but only when the costumer types the country code in with all caps, correct aligned.... etc.

<"paragraf" 'class="form_country address-field 'update_totals_on_change form-group single-country validate-required" id="billing_country_field" data-priority="60">
    <"label" for="billing_country" class="">Country&nbsp;<abbr class="required" title="required">*</abbr></label>
        <?php
        global $woocommerce;
        $countries_obj   = new WC_Countries();
        $countries   = $countries_obj->__get('countries');
        echo '<div id="my_custom_countries_field"><h2>' . __('') . '</sd2>';

        woocommerce_form_field('my_country_field', array(
                'type'       => 'select',
                'for'        => 'billing_country',
                'name'       => 'billing_country',
                'id'         => 'billing_country',
                'class'      => array( 'form_country address-field update_totals_on_change form-group single-country validate-required' ),
                'placeholder'    => __('Choose a country'),
                'default'    =>    'DK',
                'clear'      => 'true',
                'options'    => $countries
            )
        );
        echo '</div>';
        ?>