problem in sgolay filter

I have a one problem in my script.

can anyone help me to solve this problem? I attached my script below.

thanks in advance for solving the problem

clc

clear all

dataset = xlsread('hardik.csv');

x = dataset(:,1);

a = dataset(:,2);

b = dataset(:,3);

c = dataset(:,4);

dMovingAverage = conv(a,ones(13,1)/13,'same');

dSavitzkyGolay = sgolayfilt(a,3,13);

subplot(2,2,1)

plot(x,a, ...

x,dMovingAverage, ...

x,dSavitzkyGolay)

xlabel('Seq No')

ylabel('Layer Thickness')

legend('original signal','moving average','Savitzky-Golay')

dMovingAverage = conv(b,ones(13,1)/13,'same');

dSavitzkyGolay = sgolayfilt(b,3,13);

subplot(2,2,2)

plot(x,b, ...

x,dMovingAverage, ...

x,dSavitzkyGolay)

xlabel('Seq No')

ylabel('Pressure Difference')

legend('original signal','moving average','Savitzky-Golay')

dMovingAverage = conv(c,ones(13,1)/13,'same');

dSavitzkyGolay = sgolayfilt(c,3,13);

subplot(2,2,3)

plot(x,c, ...

x,dMovingAverage, ...

x,dSavitzkyGolay)

xlabel('Seq No')

ylabel('Dust Concentration')

legend('original signal','moving average','Savitzky-Golay')