Has anyone encountered this before? When uploading an example such as Blink, my Arduino Uno by itself works as expected. However, when I connect the ethernet shield to it, I am unable to upload the example Blink to the Arduino. Please see attachment (Arduino_Blink.png). The error says:
Serial port '/dev/ttyACM0' not found. Did you select the right one from the Tools > Serial Port menu?
processing.app.SerialNotFoundException: Serial port '/dev/ttyACM0' not found. Did you select the right one from the Tools > Serial Port menu?
It also gives the same error when I try to upload the example SimplePost from the Twitter library found here: http://www.arduino.cc/playground/Code/TwitterLibrary
I don't think there is anything wrong with the serial port because it works without the ethernet shield connected to the arduino unless it unexpectedly changed (??). When I do try to click Tools > Serial Port, I don't remember getting any options..
Any recommendations/thoughts are greatly appreciated. I really want to be able to tweet from the Arduino.. That is my goal.