USB not seen on Arduino serial port list

Mac osx, Macbook air , Arduino micro, USB cable, When attempting to upload a sketch I get an error message

This report would have more information with "Show verbose output during compilation" enabled in File > Preferences. Arduino: 1.0.6 (Mac OS X), Board: "Arduino Micro" Binary sketch size: 4,696 bytes (of a 28,672 byte maximum) processing.app.debug.RunnerException: Serial port '/dev/tty.Bluetooth-Modem' already in use. Try quitting any programs that may be using it. at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:158) at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67) at processing.app.Sketch.upload(Sketch.java:1666) at processing.app.Sketch.exportApplet(Sketch.java:1622) at processing.app.Sketch.exportApplet(Sketch.java:1594) at processing.app.Editor$DefaultExportHandler.run(Editor.java:2382) at java.lang.Thread.run(Thread.java:695)

If I go to "tools/choose serial port" I have no option for USB. here are my 4 options /dev/tty.Bluetooth-incoming-port result from checking this option "done uploading" no change in led /dev/cu.Bluetooth-incoming-port result from checking this option "done uploading" no change in led /dev/tty.Bluetooth-Modem result from checking this option "see above error message" /dev/cu.Bluetooth-Modem result from checking this option "see above error message"

I found the issue. I had to download the FTDI driver for mac osX. I am able to load and run scripts.