Unexpected Error occur on apply career

I got below error message when try to apply Senior Software Engineer, Gameplay (R021137).

unexpected error occurred while processing your application. please try again after some time.

I find other drafts and try these ways.

  • Delete cookie and retry
  • Retry with vpn on
  • Retry by other browser
  • Retry by phone or tablet
  • Retry by phone or tablet, with vpn on

I guess it has regional block or some condition, but no way to know it.

Can I get some help about this?
And Want to know what occur this problem If possible.