what is the meaning of the following error in the given part of code.?

Error:

Processing Image-1 (Database)
Images/Database/2.jpg 
'siftWin32' is not recognized as an internal or external command, 
operable program or batch file.

Error using sift (line 60)
Invalid keypoint file beginning.

Code:

if isunix
    command = '!./sift ';
else
    command = '!siftWin32 ';
end
command = [command ' <tmp.pgm >tmp.key'];
eval(command);

% Open tmp.key and check its header
g = fopen('tmp.key', 'r');
if g == -1
    error('Could not open file tmp.key.');
end
[header, count] = fscanf(g, '%d %d', [1 2]);
if count ~= 2
    error('Invalid keypoint file beginning.');
end

Answer 1

[Image Analyst]

It means you don't have siftWin32 as a program, at least not one that's visible when run from your current folder. Can you do

 >> !siftWin32

from the comman line?