error while using imfilter function in matlab

code:

function result=gaussian_pyramid(img,level)
    img=im2double(img);
    h = 1/16* [1, 4, 6, 4, 1];
    filter = h'*h;
    result{1} = imfilter(img, filter, 'replicate', 'conv');
    temp_img = img;
    for i = 2 : level
        temp_img = temp_img(1 : 2 : end, 1 : 2 : end);
        result{i} = imfilter(temp_img, filt, 'replicate', 'conv');
    end
end

the error is attached below

Answer 1

[DGM]

The name of the filter variable is "filter", not "filt".

result{i} = imfilter(temp_img, filt, 'replicate', 'conv');

filt() is a function which, when called without any input arguments, will create an empty transfer function.

filt

ans =

  Empty transfer function.