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Serial port already in use

I have OS X 10.8.4 installed, and Arduino 1.05 running. I’m not really familiar with Arduino, this is my first time working with it. The issue I have : I can’t connect my SCK to the network because of this error.

Shortly, the repeating error I get on the site (http://test.smartcitizen.me) is :
serial port already in use. [Please, select a valid port or enable the Java Applet!]

The Java Applet must be running I believe as I got the window to run it, and I checked my brwoser settings as well.

The “blink” sketch in Arduino works fine, but connecting to the SCK-platform doesn’t work.

This is what I see in Arduino:
processing.app.SerialException: Serial port ‘/dev/tty.usbmodemfa131’ already in use. Try quitting any programs that may be using it.
at processing.app.Serial.touchPort(Serial.java:119)
at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:201)
at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
at processing.app.Sketch.upload(Sketch.java:1671)
at processing.app.Sketch.exportApplet(Sketch.java:1627)
at processing.app.Sketch.exportApplet(Sketch.java:1599)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2380)
at java.lang.Thread.run(Thread.java:680)

Anybody an idea how to solve this?