Paypal Advanced - Sorry, Service Is Temporarily Unavailable.

I checkout with my real credit card. And I use paypal-advanced.
When clicking checkout button after input card information,
Error message shows "Sorry, Service is temporarily unavailable" as picture.
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* Why does error message show up?
* Transaction is successful. Money is deposited to paypal account normally.
* But in admin mode status is "failed"
In fact, I have used same paypal-advanced account at other website.
Is that because of this? I did setting centering around other website in manager.paypal.com
How can I fix this problem? Please let me know.
Thanks.

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