Check out example codes for "Unrecognized function or variable 'matlab.internal.addons.updates.fileexchangeaddon.getTypeFromPackageInfoUrl'.". It will help you in understanding the concepts better.
Code Example 1
This is the response MathWorks support: "Our development team has been aware of this error message and it will be fixed in MATLAB R2020a Update 4. This error message won't affect your ability of using MATLAB, so please ignore it for now."
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