https://image.noelshack.com/fichiers/2017/32/7/1502643408-capture.png
What is the fifth element in the Serial.list array? It looks to me that there is only one element in that array. Try Serial.list[0].
Don't post screenshots of text! That is very unhelpful. When you encounter an error you'll see a button on the right side of the orange bar "Copy error messages". Click that button. Paste the error in a message here USING CODE TAGS (</> button on the toolbar). It is almost never appropriate to post screenshots but in some cases it is helpful to post images. You should attach and embed the image following these instructions:
http://forum.arduino.cc/index.php?topic=364156
Why are you posting to the Arduino forum about a Processing issue?