EXACT same function, just different name. One has error "input arguments of type double", why?

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Hello, I am new to Mathlab. I am taking a course that requires me to turn in my .m files (scripts and functions) with the file name lastname_first_function.m When I write a function, let's say this simple one calcarea.m

function [area] = calcarea(rad)
%calcarea calculates area of a circle
%   Format of call: calcarea(radius)
area = 2*pi*rad;
end

compared to my turn in one last_first_calcarea.m

function [area] = last_first_calcarea(rad)
%calcarea calculates area of a circle
%   Format of call: calcarea(radius)
area = 2*pi*rad;
end

The error I receive is "Undefined function 'last_first_calcarea' for input arguments of type 'double'."

Funny thing is that I sometimes do not get the error, but most of time, especially when I have longer functions/scripts, I get this error. The files are exactly the same, in the same directory, only thing is that their file names are different as well as their name in the m. file. What is causing the error, or is there any way to override it? Thanks