compile error sub or function not defined

[Jack]

Code:

' Blit out players top
        For i = 1 To MAX_PLAYERS
              If IsPlaying(i) And GetPlayerMap(i) = GetPlayerMap(MyIndex) Then
              Call BltPlayerTop(i)
          End If
        Next i

it highlights BltPlayerTop(i)

[Robin]

You don't have a sub called BltPlayerTop.