错误：缺少乘法运算符，分隔符缺失或不平衡。要构造矩阵，请使用方括号而不是括号

Question

am试图使用MATLAB APP DESIGNER设计界面。但是，我收到一条错误消息。

这是用于使用MATLAB APP DESIGNER创建用户界面

% Callbacks that handle component events
    methods (Access = private)
        % Code that executes after component creation
        function startupFcn(app, varargin)
            % Configure image axes
            app.ImageAxes2.Visible = 'off';
            app.ImageAxes.Colormap = gray(256);
            axis(app.ImageAxes, 'image');
            app.ImageAxes3.Visible = 'off';
            app.ImageAxes.Colormap = gray(256);
            axis(app.ImageAxes, 'image');

        end
        % Callback function
        function DropDownValueChanged(app, event)

            % Update the image and histograms
            updateimage(app, app.DropDown.Value);
        end
        % Callback function
        function LoadButtonPushed(app, event)

            % Display uigetfile dialog
            filterspec = {'*.jpg;*.tif;*.png;*.gif','All Image Files'};
            [f, p] = uigetfile(filterspec);

            % Make sure user didn't cancel uigetfile dialog
            if (ischar(p))
               fname = [p f];
               updateimage(app, fname);
            end
        end

我希望在运行模拟后显示用户界面。但是我收到以下错误消息：

"Missing multiplication operator, missing or unbalanced delimiters. To construct matrices, use brackets instead of parentheses".

错误指向使用METHODS函数的行。但是，MATLAB APP DESIGNER代码视图中的特定行是灰色的。结果，我无法编辑该特定行。任何建议将不胜感激。