Unrecognized function or variable 'readstruct'

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I implemented this sample code from Mathlab help:
url = "https://export.arxiv.org/oai2?verb=ListRecords" + ...
"&set=math" + ...
filename = fullfile(tempdir,"arxivData.xml");
options = weboptions('Timeout', 160);
% Parse XML code.
data = readstruct(filename,"StructNodeName","ListRecords");
After running the code, MATLAB shows this error:
Unrecognized function or variable 'readstruct'.
readstuct() is a predefined function in MATLAB and I can not understand why it says the function is unrecognized. The main source of this code can be found here: LINK . Does any one ahve an idea about this problem? I am using MATLAB R2019b .

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KALYAN ACHARJYA 2022년 5월 15일
Reason may be: this function is Introduced in R2020b Matlab Version
Its works Matlab 2020b & later version only.

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