Erro expired URL

Olá Cláudio!

Come?ou a ocorrer um erro com o plugin iugu ontem a tarde, em todas as as tentativas de pagamento com cart?o ou boleto. O pagseguro continua funcionando normalmente.
Você tem alguma solu??o para esse erro?
Minha vers?o do plugin é a 2.6.

06-16-2016 @ 13:05:26 – Doing charge for order 1934…
06-16-2016 @ 13:05:26 – Creating an invoice on Iugu for order 1934 with the following data: Array
(
[email] => [email protected]
[due_date] => 17-06-2016
[return_url] => https://online.escolarevolution.com.br/?page_id=55&order-received=1934&key=wc_order_5762a0ef5f49b
[expired_url] => https://online.escolarevolution.com.br/?page_id=55&cancel_order=true&order=wc_order_5762a0ef5f49b&order_id=1934&redirect
[notification_url] => https://online.escolarevolution.com.br/?wc-api=WC_Iugu_Credit_Card_Gateway
[ignore_due_email] => 1
[payable_with] => credit_card
[custom_variables] => Array
(
[0] => Array
(
[name] => order_id
[value] => 1934
)

)

[items] => Array
(
[0] => Array
(
[description] => Produto teste
[price_cents] => 1000
[quantity] => 1
)

)

)

06-16-2016 @ 13:05:26 – Error while generating the invoice for order 1934: Array
(
[headers] => Array
(
[cache-control] => no-cache
[content-type] => application/json; charset=utf-8
[date] => Thu, 16 Jun 2016 13:05:32 GMT
[server] => nginx/1.8.1
[status] => 422 Unprocessable Entity
[vary] => Origin
[x-rack-cache] => invalidate, pass
[x-request-id] => 7bd1a30ef779a1f13624232a4a060698
[x-runtime] => 0.020699
[x-ua-compatible] => IE=Edge,chrome=1
[content-length] => 50
[connection] => Close
)

[body] => {“errors”:{“expired_url”frown emoticon”its not a valid url”]}}
[response] => Array
(
[code] => 422
[message] => Unprocessable Entity
)

[cookies] => Array
(
)

[filename] =>
)

06-16-2016 @ 13:05:26 - Error while doing the charge for order 1934: Missing the invoice ID.

https://www.ads-software.com/plugins/iugu-woocommerce/