Error using yyaxis axes!! Argument type?

Folks,

I'm receiving the below yyaxis plotting error in one section of my code. The code works normally when I copy it to a new .mlx. I receive the error when I run the section alone within the larger program, and I also receive the error when I run the whole program. Separately, when copied into a new .mlx file, the code works exactly as is.

Notes:

1) The code was working earlier with no known changes

2) Other parts of my code in other sections use the same formatting and they work

fig42 = figure(42);
left_color = [0 0 1];
right_color = [1 0 0];
set(fig42,'defaultAxesColorOrder',[left_color; right_color]);
yyaxis right
plot(t,a,'--r','LineWidth',.5)
hold on
yyaxis left;
plot(t2,a2,'b','LineWidth',2.5)
title({'Test plot',...

Error using yyaxis

Axes argument must be a Cartesian Axes of type matlab.graphics.axis.Axes

Answer 1

[noMathWiz]

The cause of the error is figure(42) is referenced earlier in the program, so MATLAB is confused. Reassigning the figure to a different number cleared the error.