Here is a matlab code to track and count the vehicles and I'm getting so many errors. Please any one rectify the errors

THE MAIN SCRIPT IS: %% start CarRecogintion.m [FileName,PathName] = uigetfile('*.avi','Select the Traffic Video file'); trafficObj = VideoReader([PathName '\' FileName]); thresh = 40; % thershold for the difference between the frames bg = read(trafficObj, 1); % read the first frame bg_bw = rgb2gray(bg); % convert background to greyscale % ----------------------- set frame size variables ----------------------- fr_size = size(bg); % get the size of the first frame that has size 1x2 width = fr_size(2); % x height = fr_size(1); % y fg = zeros(height, width); % the image with the vehicles only

%% Create video streams frameRate = get(trafficObj,'FrameRate'); nframes = get(trafficObj, 'NumberOfFrames');

taggedCars = zeros([size(bg,1) size(bg,2) 3 71], class(bg)); % the output video with the tagged cars

taggedCars(:,:,:,1) = bg; %% Define Line for Counting Cars xy = defineLine(rgb2gray(bg)); CRegionXSt = min(xy(:, 2)); CRegionXEn = max(xy(:, 2)); CRegionYSt = min(xy(:, 1)); cRegionSize = max(xy(:, 1)) - min(xy(:,1)); countCars = 0; plotThres = 40;%the differrence of current and previous frame sumCr1 = 0;% the sum of pixels of region that user defines RC_Val = true; close all; figure(2) %% --------------------- process frames ----------------------------------- fprintf(1,'Parsing Frames... '); for i = 2:nframes fr = read(trafficObj, i); % read i frame taggedCars(:,:,:,i) = fr;

    fr_bw = rgb2gray(fr); % convert frame to grayscale 

    fr_diff = abs(double(fr_bw) - double(bg_bw));

    prev = [-12 -12]; % Keep the position of last detected counted car
    for j=1:width 
        for k=1:height
            if ((fr_diff(k,j) > thresh))
                fg(k,j) = fr_bw(k,j);
                if or(abs(prev(1) - j) > plotThres, abs(prev(2) -k) > plotThres)
                    % Plot the red rectungle around the car
                    if(and(k-2 > 0, k+2  0, j+2  100))
            countCars=countCars+1;
            RC_Val = false;
                    end
                end
            end
        end
    end
    if(RC_Val == false)
        if(abs(sumCr1 - sumCr2)  == 0)
            RC_Val = true;
        end
    end
    bg_bw = fr_bw;
    subplot(3,1,1),imshow(fr)
    title(['frame #' num2str(i)])
    subplot(3,1,2),imshow(fr_bw)
    subplot(3,1,3),imshow(uint8(fg))
    fprintf(2,'\b\b\b\b%3.0f%c',(double(i)/double(nframes))*100, '%');
end
%%Plot the Line where counting cars
 fprintf(2,'\nPlotting...     ');
 aviobj = VideoWriter('C:\Users\chris\Dropbox\Lessons\csd\cs474\project\Submit\out4.avi');
 aviobj.FrameRate = frameRate;
 open(aviobj);
for f = 1:nframes
    for i = CRegionXSt:CRegionXEn
        for j = CRegionYSt:CRegionYSt+cRegionSize
            taggedCars(:,:,:,f) = plotColor( taggedCars(:,:,:,f), j, i, 200, 150, 125 );
        end
    end
    writeVideo(aviobj, taggedCars(:,:,:,f));
    fprintf(2,'\b\b\b\b%3.0f%c',(double(f)/double(nframes))*100, '%');
end
close(aviobj);
implay(taggedCars, frameRate)
fprintf(2,'\nCars passed: %s\n',num2str(countCars));
%%end
FUNCTION ASSOCIATED IS 
Here is our function. (it have to be in the same folder where the main script is stored or to put the path of script to the matlab path).
 (Remember that the file name must be the same as the function name)

function [ out ] = plotColor( ArrayFrame, row, col, v1, v2, v3 ) %plotColor Plots the colors RGB in a RGB frame ArrayFrame(row,col,1) = v1; ArrayFrame(row,col,2) = v2; ArrayFrame(row,col,3) = v3; out = ArrayFrame; end ERRORS ARE::::

Undefined function 'defineLine' for input arguments of type 'uint8'.

Error in CarRecogintion (line 21) xy = defineLine(rgb2gray(bg));

Error: File: CarRecogintion.m Line: 48 Column: 42 Unexpected MATLAB expression.

>> CarRecogintion Undefined function 'defineLine' for input arguments of type 'uint8'.

Error in CarRecogintion (line 21) xy = defineLine(rgb2gray(bg));