cumulative volume delta amiborker afl

I am trying to code ""Cumulative Volume Delta" in AFL. My code is as follows - _SECTION_BEGIN("Cumulative Volume Delta"); uw= IIf(C>O, H-C, H-O); lw= IIf(C>O, O-L, C-L); spread= (H-L); bl= (spread - (uw-lw)); puw= (uw/spread); plw= (lw/spread); pbl= (bl/spread); x= (pbl+(puw+plw)/2*Volume)...