Code:
新しいパソコンからゲームをアクセスした後、神聖結晶をつかったらこのエラーが出ました。
セーブデータに異常があるためゲームを遊ぶことができません
The message goes something like "After accessing the game from a new computer, I got this error after using a sacred crystal."
I was on the fence about explaining the whole story (changed the clock on my computer because of GW2 support conversation, logged onto aegis, changed my time back, etc) or just playing dumb about why it happened, but my friend noted that she thought the actual story sounded like I was trying to cheat the system, so I just went with playing dumb about what happened and just said I got a new computer.
They sent a message back saying it seems my save data was corrupted, and that they're going to investigate whether or not it was a mistake or if I was trying to cheat the system by gaining time. A day later they messaged me back saying it should be fixed now and to check if it works and if I got the sacred crystal in question.
Dunno if this will be any help, but you're welcome to use the message I used. You can cut out the first part before the comma, if you want to leave out the new computer.
How to send the message:
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Scroll to the bottom of the page for the game.
[insert error message]