All tables in the bracketed expression must have the same variable names

I have two editable numeric fields and a table in app designer; the user can enter the values in these editable fields and then push a button. Then, the values are added to a table. Also, I provide an option to attach an excel folder that should have two columns to reflect on the table. Both of these work perfectly fine individually, but, if I added the values manually then attached an excel folder or vice versa, I get the following error: All tables in the bracketed expression must have the same variable names. The function that handles the editable fields:

  app.t = app.UITable.Data;
            x = app.xvalueEditField.Value;
            y = app.yvalueEditField.Value;
            nr = table(x, y);
            app.UITable.Data = [app.t; nr];  %% error happens here if I attach excel then add manually
            app.t = app.UITable.Data;

The Function of the excel folder:

text = readtable([pathname filename], "Sheet",1, 'ReadVariableNames',false);
       fl = cellfun(@isnumeric,table2cell(text(1,:))); 
if (numel(fl(fl == false)) > 0) 
    flag = false;
else
    flag = true;
end
if (flag)
            A = [app.t; text];  %% error happens here if I add manually then attach
            app.UITable.Data = A;
            app.t = text; 
end

Note: these are only the parts of the function, where I attempt to combine values

Can someone please help me?

Thank you

Solution

The error message is telling you that table only allows you to vertically concatenate tables when the 'VariableNames' properties match. This is documented here: https://www.mathworks.com/help/matlab/ref/vertcat.html#btxzag0-1 .

In your first code example, the table nr will have variable names x and y (derived from the names of the underlying variables you used to construct the table). You could fix that case by doing:

% force nr to have the same VariableNames as app.t:
nr = table(x, y, 'VariableNames', app.t.Properties.VariableNames);

and in the second case, you can force text to have the correct variable names like this:

text.Properties.VariableNames = app.t.Properties.VariableNames