I was able to run the code you shared with no warnings or errors. 'layers' was generated and has the 11 layers that are expected. I attached the variable 'layers' as a MAT file to this answer so you can check.
It seems like the issue could be computer or connection specific...
Also, I ran the code in all MATLAB versions between R2014a and R2016b and 'layers' was always generated, so the issue may not be related to a specific MATLAB version.
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