Please go to your sequencers MIDI settings and turn off 'Spark private In' and 'Spark private Out'.
Spark software needs exclusive access to those in/out MIDI ports, so in order to do that, those 2 need to be free of use by the DAW (or any other app).
There's some references to this in the manual, page 75, 7.1.1. Device ports
For instance, on Ableton Live, I had to go to Options, Preferences, MIDI Sync, find those 2 ports and turn them OFF so Live doesn't try to use them, leaving them free for the Spark plug-in.