Matlab does not recognise my function

Question

After running the code

xone = 2.5;
xtwo = 3.5;
root = bisection(xone,xtwo);

function root = bisection(xone,xtwo)
    while abs(funcx(xthree)) > 0.0001
        xthree = (xone+xtwo)/2;
        if funcx(xthree) > 0
            xone = xthree;
        elseif funcx(xthree) < 0
            xtwo = xthree;
        else
    end
    root = xthree;
end

function fofx = funcx(x)
    fofx = 3 * exp(-x) - x + 3;
end

disp(root)

I get the error

Unrecognized function or variable 'bisection'.

As far as I am aware, I have nested my function correctly. Any ideas?