Issue with swap file

[Andre Goree]

Several months ago, I followed the procedure here[1] for creating a swap 
file.  This worked great for a long time, up until my last reboot which 
coincided with an update to 10.1.

agoree at fbsd10-atl ~ % grep swap /etc/fstab
md99            none            swap    sw,file=/usr/swap 0     0
agoree at fbsd10-atl ~ % sudo swapon -a
swapon: mdconfig (attach) error: md99 on file=/usr/swap

I've also tried zero-writing the file again, to no avail.  Any ideas?

[1] https://www.freebsd.org/doc/handbook/adding-swap-space.html

-- 
Andre Goree
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