'Reference to non-existent field'

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Hi all. I'm studying this code of exporting surface to STL file. However, MATLAB shows 'Reference to non-existent field 'a'.', which I cannot get it. Can anyone help me with that?
Thanks in advance!

Accepted Answer

madhan ravi
madhan ravi on 9 Nov 2018
it means your mat file doesn't contain a
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