Unrecognized function or variable 'mustBeA'.

Not all built in functions are loaded in Matlab. If I check 'mustBe .. ' functions (data type validation) , all the numeric ones are loaded but string and other data types are not. How do I install 'mustBeA' function? I am using Matlab version 2020a
(Unrelated note : when I start Matlab from terminal- I get the warning ' Failed to load module "overlay-scrollbar" Failed to load module "canberra-gtk-module" ' . Could this be the reason? I haven't had issues without the 2 modules so far, therefore I have ignored it.)

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Jan
Jan 2021-8-30
编辑:Jan 2021-8-30
The function mustBeA was introduced in Matlab R2020b. You are using 2020a. In consequence upgrading the the way to go or write a replacement function by your own.

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