Error using handle.handle/get Invalid or deleted object.

I'm trying to find coordinates A and B for a transfer function G. However, when I input this

clear, clc
B = 0.0160952381;
v = 0.75;
l = 100;
wc = 0.008;

s = tf('s');
w = 0.001:0.001:1;
s = w.*i;
Psi = ((s.^2+2.*s.*B)./v.^2).^(1/2);
G = B ./ (coth(Psi.*l).*(Psi.*l).*v./l+(s+B));

nr = get(G,'num');
A = nr{:};
nr = get(G,'den');
B = nr{:};

all I get is this error:

Error using handle.handle/get
Invalid or deleted object.

Error in untitled (line 17)
nr = get(G,'num');

What am I doing wrong?

[Image Analyst]

What are you expecting to do with the get() function?

[Weronika Ring]

I'm expecting the get() function to give me the coefficients of the polynomial G.

[Image Analyst]

What toolbox is get() and tf() in? I don't have them. Isn't G an array of numbers? Or is it a symbolic thing?

[madhan ravi]

Replying to the comment [https://in.mathworks.com/matlabcentral/answers/461624-error-using-handle-handle-get-invalid-or-deleted-object#comment_704372 ]:

See attached file