/dev/mapper/cryptswap1 problem on boot?

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http://askubuntu.com – Just before the boot logo fades away and the login screen shows, there's a little message that says there was some kind of problem with /dev/mapper/cryptswap1 and I have to press S or M or something, then everything continues as normal and I don't really know what's going on. So, is anything seriously wrong (because the computer is still functioning fine)? If so, how do I fix it, and if not, how do I stop the message from showing? Thanks. (HowTos)