Error in Function writing

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Trying to create a function of the logistic map xn+1=mu*xn*(1-xn) to calculate and output N+1 states, but I keep getting the error 'Undefined function or variable 'mu'' after using mu as an input argument to the function. Anyone know how to fix this?

function output= logistic_map(mu,x0)
    N=20;   % the number of states to be generated after the initial state
    % Error check
    if mu > 4 || mu < 0
        error('mu parameter must lie in the range 0 to 4 ')
        return  % forcing an early return
    end
    
    x=x0;
    output= zeros(1, N+1); % Storage matrix of N+1 numbers
    output(1,1)=x; % The first value in the matrix is initialised to the first value of x
    
    for count = 1:N
        x=mu*x*(1-x);
        output(1,count+1)=x;
    end
    end