WooCommerce error changing order status.

I’m getting the error:

Exception thrown The cURL PHP extension is required to use the cURL consumer with fork = false. Try setting fork = true or use another consumer.

When changing an order from Pending payment to processing.
If I go back to the order page after the error message the order will have changed to processing.
The issue seem to have started when I updated the the newest version of WooCommerce.

I have no idea on what to do.