v19 Taskbar

I was having a problem with my taskbar. here is the error
wheren can I define this?

d:\Flyff\Source v19\Program\_Interface\WndTaskBar.h(50): error C2065: 'm_bPickup_SLIDE' : undeclared identifier


here is my Line 50 in the WndTaskBar.h

void PickupModeSlide(){ m_bPick = &m_bPickup_SLIDE; }

thanks in advance :)
:handsdown: