maybe it's about sync

Every time I reopen MPC project file which have about 6 track in it,
one of them is piano track, program is Inst-Piano-oFi Upright,
then I can't play with midi keyboard (MPC mini3),
I have been checked MPC software MIDI LEARN enable button , reset preference MIDI/Sync button but it still won't work!
any one can help?

Has your keyboard TRACK activated? Did you arm the correct track?