Lloydsalgorithm: Color value must be a 3 element numeric vector

I ran the Lloydsalgorithm function for a shapefile of one of Ohio's congressional districts. It accepts the file and iteratively draws a Voronoi diagram with the number of robots that I give it (n robots create n regions, or cells). The original code, without my additions, can be found at http://www.mathworks.com/matlabcentral/fileexchange/41507-lloyds-algorithm/content/lloydsAlgorithm.m

My problem is in this part of the code, where I am coloring the cells. The error message deals with the bolded line; it says, "Error using plot; Color value must be a 3 element numeric vector". I'm not sure what this is telling me. Any suggestions are welcome and greatly appreciated; if you would like to see the entire file, you can find it here: https://drive.google.com/?tab=mo&authuser=0#folders/0B3fa1Bco9n2EcV9jbHc3RENfLWM

%%%%VISUALIZATION
  if showPlot
      verCellHandle = zeros(1,n);
      cellColors = cool(n); 
      for i = 1:numel(Px) % color according to
          verCellHandle(i)  = patch(Px(i),Py(i),cellColors(i,:)); % use color i  -- no robot assigned yet
          hold on
      end
      pathHandle = zeros(1,n);    
      %numHandle = zeros(n,1);    
      *for i = 1:numel(Px) % color according to
          pathHandle(i)  = plot(Px(i),Py(i),'-','color',cellColors(:,i)*.8);*
      %    numHandle(i) = text(Px(i),Py(i),num2str(i));
      end
      goalHandle = plot(Px,Py,'+','linewidth',2);
      currHandle = plot(Px,Py,'o','linewidth',2);
      titleHandle = title(['o = Robots, + = Goals, Iteration ', num2str(0)]);
  end

Answer 1

[José-Luis]

 pathHandle(i)  = plot(Px(i),Py(i),'-','color',cellColors(:,i)*.8);*

Should be

 pathHandle(i)  = plot(Px(i),Py(i),'-','color',cellColors(i,:)*.8);