Audio Recording Via Wire Fire

Hey, I’m trying to record Audio from my keyboard to Cubase 9 which is connected through Fire Wire mixer ( Mackie 1220i ),
but no sound! Although, when I create new project, every thing working perfectly.( same connections )
I need your help.
I tried to
change different channels, No sound
checked system config. All fine
turn on & off + Re-open project. Nothing !!
All other VST instruments in the project are working perfectly.