Hi,
I don't understand the reason for "bad var spec: no newline"... Checking Tasker docs, looks like there was a change in what Tasker expects... But seems to be just a warning (and the second one, too) -- I just tested the plugin, and it did match on an incoming message, as expected...
However, if you're running Aqua 1.5.0.*, please update to the latest 1.5.1-dev build -- there were fixes on my side between 1.5.0 and now.
I will look into the first warning.