Mac - Serial Port Grayed Out

Development Tools IDE 1.x
1

I'm trying an Arduino for the first time in a workshop. Tools-Serial Port is grayed out. I've tried all the recommendations I know how to do as listed in the troubleshooting. Don't know my way around java or serial ports on a Mac so I'm clueless where/how to check things related to them. My instructor has done cursory checks but is also clueless. Can anyone perhaps point me in the right direction to get my Arduino Uno talking to my MacBook Pro?

Running Mac OS 10.6.8

Arduino UNO

First time using Arduino.

Tools - Serial Port is grayed out.

Get the following message:
java.lang.ClassCastException: gnu.io.RXTXCommDriver cannot be cast to gnu.io.CommDriver thrown while loading gnu.io.RXTXCommDriver

2

Quick question

Do you have Processing installed as well?

The message is showing some incompatibility while loading the RXTX library that let's the Arduino IDE communicate with the serial ports (i.e. the Arduino Uno)

If there is a different version somewhere in the classpath this can create these issues.

3

Massimo,

Thank you for helping. To answer your questions:

<Quick question Do you have Processing installed as well?>

I have no idea what Processing is so I will answer no.

The different version theory would be a good one. How does one check to verify the versions (for serial drivers?) are correct?

Dan