Always error when checkout during purchase!

Always error when checkout during purchase!

I tried all 3 browsers (IE, Firefox and Chrome)
All gives error at checkout page
I have tried more than 10 times
I even tried with "Checkout without registering accounts"
All failed.
Any1 facing similar errors?

The error:
An unexpected error occurred. We apologize for the inconveniences this may have caused

I test with United States as country and it was able to proceed

But my address is South Korea
in the information page, it says it is able to ship to South Korea
BUT why it keeps give me error when checkout??

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