Error in the pagseguro module

I'm using the pagseguro API to make purchases on my site, it was working fine, normally. Today when I went to use again it started to present this error:

Not Found

The requested URL /admin/usuario/
Fatal error: Uncaught exception 'Exception' with message 'CURL can't connect: Protocol https not supported or disabled in libcurl' in /home/onecom/public_html/admin/PagSeguroLibrary/utils/PagSeguroHttpConnection.class.php:120Stack trace: was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

My Token and configured email are correct, but I do not know what it can be. The code I'm using:

<?php 

require_once "../PagSeguroLibrary/PagSeguroLibrary.php";

class CreatePaymentRequest
{

    public static function main()
    {

        $paymentRequest = new PagSeguroPaymentRequest();

        $paymentRequest->setCurrency("BRL");

        $paymentRequest->addItem('0001', 'notebook', 2, 430.00);

        $paymentRequest->addItem('0002', 'notebook 2', 2, 560.00);


        $paymentRequest->setReference("REF123");

        $paymentRequest->setRedirectUrl("http://www.lojamodelo.com.br");


        try {

            $credentials = new PagSeguroAccountCredentials("[email protected]","MEU-TOKEN");

            $url = $paymentRequest->register($credentials);

            self::printPaymentUrl($url);
        } catch (PagSeguroServiceException $e) {
            die($e->getMessage());
        }
    }

    public static function printPaymentUrl($url)
    {
        if ($url) {
            echo "<h2>Criando requisi&ccedil;&atilde;o de pagamento</h2>";
            echo "<p>URL do pagamento: <strong>$url</strong></p>";
            echo "<p><a title=\"URL do pagamento\" href=\"$url\">Ir para URL do pagamento.</a></p>";
        }
    }
}

CreatePaymentRequest::main();
?>