Error sending information to an Arduino bord

[Joseph_Harkin]

Hi I am trying to connect my phone to an Arduino board but I get this message every time I want to send data to the Arduino:

“Attempt to invoke virtual method ‘int android.hardware.usb.UsbDeviceConnection.bulkTransfer(android.hardware.usb.UsbEndpoint, byte, int, int)’ on a null object reference”

Thanks

[Smart_DR (Sm@rtDR)]

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