Errors in demo

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- **Describe the issue that you are experiencing**
I'm trying to run through the demo script but it seems to encounter some errors that I can't figure out how it's being caused.

- **Copy error log below**

Error in montage/loadimages (line 1084)
M.im(nprev+i) = fn_structmerge(model,simi);

Error in montage (line 43)
loadimages(M,varargin{:})

Error in demo_script (line 90)
subplot(121); montage(extract_patch(A(:,keep),[d1,d2],[30,30]),'DisplayRange',[0,0.15]);

- **If you're not reporting an error, type your message below**