Account My Key has already been used?

I received an email prompting me to get take action to get the beta of Castle Story from Humble Bundle.com. However when I went through all of the registration it said my key had already been used. did someone use it before i had a chance to or is there something else I should be doing?

I'm having the same problem. So it's not just you...I was really looking forward to playing tonight. :-(

Okay, figured it out...Turns out it's just the prototype. I didn't read the e-mail fully, and when I clicked the humblebundle link, it said beta. I thought they had already got to that point. So, at least my key is not eligible for the prototype. I'm not sure why it said the my key had been used though...scared me a little. >.>

Same Problem here. I read through the e-mail completely and at the end it says:

“ If you're not in the Prototype... and are just getting the Beta, you can give out your gifts and go through all the registrations
You just wont get a download quite yet. Feel free to join us at the Livestream too! “

So normally we should be able to regist our accounts without any problems.

ok. Thanks for clearing that up for me I was just a little worried lol