Issue with Switch state in AppDesigner

Hello, I am migrating from GUIDE to Appdesigner and can't understand why Im getting an error

I have a switch that I want to change the color of a lamp component:

        % Value changed function: VioletSwitch
        function VioletSwitchValueChanged(app, event)
            value = app.VioletSwitch.Value
            if value=='On'
                app.Lamp_V.Color='#b700ff';
            else
                app.Lamp_V.Color='r';
            end  

This works when the switch is on, but not when the switch is off, I get the following error message which I dont understand

value =

    'Off'

Matrix dimensions must agree.

Error in Spectrometer/VioletSwitchValueChanged (line 174)
            if value=='On'

Answer 1

[Cameron B]

function VioletSwitchValueChanged(app, event)
            value = app.VioletSwitch.Value
            if strcmpi(value,'On') == 1 
                app.Lamp_V.Color='g';
            else
                app.Lamp_V.Color='r';
            end  

[Jason]

Thankyou, I've also found switch works, but I'd like t find out why the if else doesnt work

[Cameron B]

Yes, switch might be a better option for this. I edited my original response and replaced 'b700ff' with 'g'