How to correct the error involving function ?

I try to run the matlab code from internet about B-spline.But t does not work and the error " not enough input arguments " appear. I don't really understand how the function in matlab works. This is the matlab code.

function spline(n,order)
% function spline(n,order)
%
% Plots the B-slpine-curve of n control-points.
% The control points can be chosen by clicking
% with the mouse on the figure.
%
% COMMAND:  spline(n,order)
% INPUT:    n     Number of Control-Points
%           order Order ob B-Splines
%                 Argnument is arbitrary
%                 default: order = 4
%
% Date:     2007-11-28
% Author:   Stefan Hüeber

close all;
if (nargin ~= 2)
  order = 4;
end
nplot = 100;
if (n < order)
  display([' !!! Error: Choose n >= order=',num2str(order),' !!!']);
  return;
end
figure(1);
hold on; box on;
set(gca,'Fontsize',16);
t = linspace(0,1,nplot);
for i = 1:n  
  title(['Choose ',num2str(i),' th. control point']);
  p(i,:) = ginput(1);
  hold off;
  plot(p(:,1),p(:,2),'k-','LineWidth',2);
  axis([0 1 0 1]);
  hold on; box on;
  if (i  >= order) 
    T = linspace(0,1,i-order+2);
    y = linspace(0,1,1000);
    p_spl = DEBOOR(T,p,y,order);
    plot(p_spl(:,1),p_spl(:,2),'b-','LineWidth',4);
  end
  plot(p(:,1),p(:,2),'ro','MarkerSize',10,'MarkerFaceColor','r');
end
title(['B-Spline-curve with ',num2str(n),' control points of order ',num2str(order)]);

How to solve this problem ? Is there any mistake that I should change ? This is not my coding. I copied it from internet to see how it works. But it doesn't work.

[Walter Roberson]

Which line does it complain that there are not enough input arguments?

How are you executing the routine? What parameters are you passing to it?