Problem of baking

Hello everyone, I am a newbie to gh with python. I am currently learning from a youtube and encountered a problem in Baking even I have followed the video. Are there any kind people share your knowledge on it? Many thanks.

import rhinoscriptsyntax as rs
import Rhino.Geometry as rg
from Grasshopper.Kernel import GH_RuntimeMessageLevel as rml
import scriptcontext as sc
import System.Drawing as sd
import Rhino.DocObjects as rd
        
geo = []
colours =[]
        
        
for x in range(int(eX)):
    for y in range(int(eY)):
        pt1 = rg.Point3d(x*eX,y*eY,0)
        pt2 = rg.Point3d(x*eX+1,y*eY,0)
        pt3 = rg.Point3d(x*eX,y*eY+1,0)
        plane = rs.PlaneFromPoints(pt1,pt2,pt3)
        dis = rs.Distance(pt,pt1)
        geo.append(rg.Box(plane,rg.Interval(sX/2*-0.9,sX/2*0.9),rg.Interval(sY/2*-0.9,sY/2*0.9),rg.Interval(sZ/2*-0.9,dis/2*0.9)))
        colours.append(sd.Color.FromArgb(x/eX*250,y/eY*250,150))
        
def baker():
    for i in range(len(geo)):
        brep = rg.Brep.CreateFromBox(geo[i])
        attr = rd.ObjectAttributes()
        attr.ColorSource=rd.ObjectColorSource.ColorFromObject
        attr.ObjectColor = colours[i]
        sc.doc.Objects.AddBrep(brep, attr)
                
if bake:
    baker()

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