Why do I get the error “Unrecognized function or variable”?

I am receiving one of the following error messages. How can I resolve this issue?

Undefined function or variable ‹Name›.
Unrecognized function or variable ‹Name›.
Undefined function or method ‹Name› for input arguments of type ‹ClassName›.

NOTE:-

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MATLAB does not recognize the specified string as the name of a function on the MATLAB path or as a variable. The above error messages can be caused by:

1) Trying to use a variable that has not been defined before this line of code executes.

>> x=1:10;
>> t=x.^2;
>> plot(x,y)
Undefined function or variable 'y'.
% Possible corrections:
% Change line 3 to "plot(x,t)"
% or Change line 2 from "t=x.^2;" to "y=x.^2;"

2) A typographical error when typing a function or variable name. However, later versions of MATLAB try to resolve these typos with “Did you mean” suggestions. For example,

>> foo = 42;
>> fo0
Undefined function or variable 'fo0'.
Did you mean:
>> foo

3) The wrong case for a f…

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Why do I get the error "Unrecognized function or variable"?

Why do I get the error "Unrecognized function or variable"?