GUI window Error when calling function in a function run

Hi All,

I am initializing a GUI and I am executing the "portfolio" function from Trading Toolbox but it does not give any result( runs for ever) and I need to terminate it. When I am runing the portfolio function outside the GUI function it returns results.

Can you please help me find the error and what I am doing wrong?

function trading
% GUI window
    clc;
    clear all;
    close all;
    GUI = [];
    ib = ibtws('',7497);
    account='DU2154444';

    initGUI();
    % Display the GUI window
    function initGUI()

        % Initialize some data
        GUI.cycle = 0;
        GUI.lastPortfolio = [];
        GUI.trading = false;
       
        portfolioData = portfolio(ib,account)
        
    end

end