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Please post the output of this command:
grep swap /etc/vfstab

You do not see two swap space, just two (or more) filesystems backed by virtual memory. No big deal.

That's weird. I don't reproduce that behavior. Anyway, you can just temporarily comment out the vfstab line for "swap -a" to work, or simply reboot while keeping the line intact.

After which command did you get this error message ?

There are plenty of evidences in your posting that show you are using zfs.

My solution won't survive a reboot but adding a single line to /etc/vfstab referencing swap1 would make it persistent.
...

You cannot use a file based swap file when that file is on ZFS. Simply add a zvol instead.
zfs create -V 5gb rpool/swap1
swap -a /dev/zvol/dsk/rpool/swap1