Invalid Message ID Format. Is my syntax wrong?

function area = areaof3ang(x1,y1,x2,y2,x3,y3)
if nargin~=6
    error(message('You need to input 6 values for 3 points. As in x1,y1,x2,y2,x3,y3'));
end
area=abs((x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2))/2)

end

When I deliberately input 2 variable, it shows me this error.

Error using message
Invalid Message ID format: 'You need to input 6 values for 3 points. As in x1,y1,x2,y2,x3,y3'.

Error in areaof3ang (line 3)
    error(message('You need to input 6 values for 3 points. As in x1,y1,x2,y2,x3,y3'))

What am I doing wrong?

Answer 1

[Marc Jakobi]

You do not need message() for that function.

function area = areaof3ang(x1,y1,x2,y2,x3,y3)
if nargin~=6
    % this is sufficient:
    error('You need to input 6 values for 3 points. As in x1,y1,x2,y2,x3,y3');
end
area=abs((x1*(y2-y3) + x2*(y3-y1) + x3*(y1-y2))/2)
end