problem face in matlab 2020b
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Shubham Rawat on 28 Jan 2021
It is clearly mention in your error that Optimization Toolbox is not installed in this version of your MATLAB.
You may look into this link for how you can install additional toolboxes.
How do I install additional toolboxes into an existing installation of MATLAB? - MATLAB Answers - MATLAB Central (mathworks.com)
Hope this Helps!