Yes, this is a known bug and it is easily fixed by editing the code (just take out the extra "mod/").
Unfortunately, there are other more serious bugs in this currently unmantained module that render it unsuitable for use. See a previous message from Martin Dougiamas down in this forum in the thread "Session key", calling for someone willing to rewrite it.
As a workaround, I use a fake "assigment" module (without any assigment) when I need to take attendances.
cheers,
Piersante
Attendance (plugin)
'Add multiple' error and gradeable error
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