Qt Error: Uncaught ReferenceError: QWebChannel is not defined

string rampname = "myramp";
// use next line to create a ramp, you can not use variable as name here
// float ramp = chramp("myramp",0);

// see below, we add 1 because of the ramp marker numbers
// they start at 1 not at 0, i've added it here and for loop starts with  i = 1
float count = ch(rampname) + 1;

for (int i = 1; i < count; i++) {
    // create prefix, a markers name is rampname + markernumber
    // eg. myramp1, myramp2, ...
    string ramp_pt = rampname + itoa(i);
    // then add the value to grab, hover the Position label to see the name
    // eg. myramp1pos
    float ramp_pt_pos = ch(ramp_pt + "pos");
    float ramp_pt_value = ch(ramp_pt + "value");
    float ramp_pt_interp = ch(ramp_pt + "interp");
    // set the primuv vector to grab
    vector uv = set(ramp_pt_pos,0,0);
    vector pos = primuv(1, "P", 0, uv);
    // create a new point
    int pt = addpoint(0,set(pos));
    // and add desired attributes or groups
    setpointattrib(0,"ramp_pos", pt, ramp_pt_pos);
    setpointattrib(0,"ramp_val", pt, ramp_pt_value);
    setpointattrib(0,"ramp_interp", pt, ramp_pt_interp);
    setpointgroup(0, "copy", pt , 1);
}

@P.y = @P.y + @ramp_val;