"Unrecognized function or variable" error due to unrecognized function, which is indeed defined.

I got the following error message:

Unrecognized function or variable 'Afunc'.

Error in update_xf>@(x)Afunc(x,CGparams) (line 80)

Afunc = @(x)Afunc(x, CGparams);

Error in CG (line 4)

r = rhs - Afunc(x);

Error in update_xf (line 82)

[xf{i}, noit_cg]=CG(xf{i}, Afunc, (1/sigma2^2)*rhs{i}, CG_MAX_ITER, CG_TOL);

But the function Afunc is defined at the end of file update_xf:

function Ax = Afunc(x, params)

Ax = (1/params.sigma2^2)*conv2(conv2(x,params.k,'same').*params.mask, flip(params.k),'same');

Ax = Ax + params.weights.*x;

end

The call to CG is done in update_xf as:

Afunc = @(x)Afunc(x, CGparams);

[xf{i}, noit_cg]=CG(xf{i}, Afunc, (1/sigma2^2)*rhs{i}, CG_MAX_ITER, CG_TOL );

And in CG to Afunc as:

function [x_new,it]=CG(x, Afunc, rhs, CG_MAX_ITER, CG_TOL)

r = rhs - Afunc(x);

This error happens to me in version 2019b but it is working OK in 2010b