Do my Due is well installed?

Hardware Arduino Due
1

Hi,

I'm using Processing to read a data of an array and sometimes Processing say

Error, disabling serialEvent() for /dev/cu.usbmodem1421
null

I have to close and start Processing to fix this problem

Morever, my Arduino Due doesn't appear in my network preference at all!

While it should at least appear as “Not Configured”.

What can I do?

Thanks.

I am on Mac OS High Sierra 10.13.