Honestly, I’m starting to hate this keyboard. Weird behaviour, a sustain that sometimes kicks in without pressing the pedal, a meh velocity response and these maddening CRYPTIC error messages, that pop up even without ANY Keylab outputs activated in Ableton.
The message suggest your keylab is set up wrong in your DAW. This can perhaps give midi feedback, that can create strange behaviors.
Try and go into your DAW setups and do like the message suggest.