C:\Users\Yatao\Documents\Arduino\hardware\MIDICtrl20_MegaCommand\avr\cores\megacommand\MCL\MCL.cpp: In function 'bool mcl_handleEvent(gui_event_t*)':
C:\Users\Yatao\Documents\Arduino\hardware\MIDICtrl20_MegaCommand\avr\cores\megacommand\MCL\MCL.cpp:132:32: error: call of overloaded 'opt_copy_track_handler()' is ambiguous
opt_copy_track_handler();
^