This MATLAB code has error please help me fix it:

$\%$ Define grid dimensions

$[$x$,$ y$,$ z$]=$ meshgrid$(-2$:$0\mathrm{.}2$:$2,-2$:$0\mathrm{.}2$:$2,-2$:$0\mathrm{.}2$:$2)$;

$\%$ Define potential values $($example$)$

potential $=$ x$.^2+$ y$.^2-$ z$.^2$;

$\%$ Calculate electric field components $($example$)$

$[$Ex$,$ Ey$,$ Ez$]=$ gradient$(-$potential$)$;

$\%$ Create figure

figure;

$\%$ Plot equipotential lines

subplot$(1,2,1)$;

contour$3($x$,$ y$,$ z$,$ potential$)$;

title$(\text{'}$Equipotential Lines'$)$;

xlabel$(\text{'}$x$\text{'})$;

ylabel$(\text{'}$y$\text{'})$;

zlabel$(\text{'}$z$\text{'})$;

grid on;

axis equal;

$\%$ Plot electric field lines$/$surface

subplot$(1,2,2)$;

quiver$3($x$,$ y$,$ z$,$ Ex$,$ Ey$,$ Ez$)$;

title$(\text{'}$Electric Field'$)$;

xlabel$(\text{'}$x$\text{'})$;

ylabel$(\text{'}$y$\text{'})$;

zlabel$(\text{'}$z$\text{'})$;

grid on;

axis equal;

$\%$ Optionally, you can also use streamline to visualize field lines more clearly:

$\%$ streamline$($x$,$ y$,$ z$,$ Ex$,$ Ey$,$ Ez$)$;

$\%$ Optionally, you can adjust the plot appearance and add other settings as needed.

Error using contour$3($line $42)$

Input arguments must have at most $2$ dimensions.