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I just installed processing on my Mac High Sierra version 10.13.3 and when try to run gctrl.pde does not work. When executing
String result = (String) JOptionPane.showInputDialog (this, "Select the serial port that corresponds to your Arduino board.", "Select serial port", JOptionPane.PLAIN_MESSAGE, null, Serial.list (), 0);
gives problems in the showInputDialog function.
Someone could help me?