"Too many input arguments" error on function within GUI code

Hey! I am writing a GUI that takes in the data from an excel file and then plots in and fits a curve to the data to extract some characteristics of the curve. The code that I have written to build the GUI works fine, but when I try to get the callbacks for the uicontrols to work, I get an error. Here is the code that I am using:

rhUpload         = uicontrol(...
                        'Style', 'pushbutton',...
                        'String', 'Upload Data',...
                        'Parent', rhMainFigure,...
                        'Units', 'normalized',...
                        'Callback', @rhImport,...
                        'Position', [0.7 0.25 0.2 0.03],...
                        'FontSize', 11);

is the code that creates the UI pushbutton

    function rhData = rhImport
        [file,path]=uigetfile;
        rhData = xlsread(fullfile(path,file));

is the code that executes when the pushbutton is pressed. However, when I press the button, I get the following error:

Error using RheologyGUI>rhImport
Too many input arguments.

Error while evaluating uicontrol Callback

Interestingly, I took the function code and created a separate m-file for just that function, and when I execute it, it works fine. Do you know what may be causing this error? Thanks!

Answer 1

[Amit]

Try rhImport(hObject,eventdata) instead of just rhImport.

[Walter Roberson]

Right. Graphics callbacks are automatically passed two arguments.

[CS MATLAB]

Thank you Amit