I'm really excited to use this extension, but...

I'm encountering this "no Mail content to send" at every turn, and I'm not sure why. I have both the Kunena and K2 plugins installed and enabled, and my chosen Alert has "Respect last email date" set to, "no." I receive the error when I try to "simulate," "preview" (from the simulation page) and "preview" from the user page.

Does anyone know something that I might be missing?

Thank you.