MATLAB: CAT arguments dimensions are not consistent

Question

Hey Guys, I've a smale Problem with a Listbox.I have created a GUI with a Listbox which has the task to display Names from an Array.The main Problem is, matlab says: CAT arguments dimensions are not consistent.I know what matlab is trying to tell me, but i dont know how to solve it. Here is the Code.

if UsedAmplification == 1 
         ListboxInput = get(handles.PlotedShotsListbox,'String')
         ListboxContent = [num2str(shot),' ','UsedAmplification']
         ListboxOutput =  [ListboxInput,ListboxContent]
         set(handles.PlotedShotsListbox,'String',ListboxOutput)
  end
if closestAmplification == 1
         ListboxInput = get(handles.PlotedShotsListbox,'String')
         ListboxContent = [num2str(shot),' ','ClosestAmplification']
         ListboxOutput = [ListboxInput,ListboxContent]
         set(handles.PlotedShotsListbox,'String',ListboxOutput) 
  end

Answer 1

The trick was:

ListboxContent =  {num2str(shot),' ','UsedAmplification'}

so it becomes a String Array or an String Array.