R – UISlider Available Value

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Updated Code:

Add this code in function.php file:

function my_woocommerce_add_error( $error ) {
    if (strpos($error,'required') !== false) {
        $error = 'Required';
    }
    return $error;
}
add_filter( 'woocommerce_add_error', 'my_woocommerce_add_error' );

and add this code in notices\error.php file:

<ul class="woocommerce-error">
    <?php 
    $totalReq = count(array_keys($messages, 'Required')); 
    $removeReq = array_diff($messages, ["Required"]);

    if($totalReq > 1){
        echo '<li>Please fill in all the <strong>required</strong> fields.</li>';
    }else{
        echo '<li>Please fill in the <strong>required</strong> field.</li>';
    }
    ?>
    <?php foreach ( $removeReq as $message ) : ?>
        <li><?php echo wp_kses_post( $message ); ?></li>
    <?php endforeach; ?>
</ul>

Hope it will resolve your concern :)