I have built the program as described in the YouTube article youtube.com/watch?v=gL7b8E_5aYs . The HC05 connected to the Arduino Uno is paired the Samsung smartphone. When the slider in the app is moved an error appears "Error 515: Not connected to a Bluetooth device". The first ListPicker1 block…

Thanks @ABG I replaced the NOTIFIER block and everything worked out [screenNEW]