Unable to load programs in Arduino UNO [Solved]

Development Tools IDE 1.x
1

Hello.

I just bougt a Arduino Starter Kit from www.cooking-hacks.com with and Arduino UNO inside. I use ArchLinux and I followed all the steps of the Arch Wiki. But I can't load a program inside the Arduino. Here go the error output:

Tamaño binario del Sketch: 466 bytes (de un máximo de 32.256 bytes)
processing.app.SerialNotFoundException: Puerto serial '/dev/ttyACM0' no encontrado. ¿Estás seguro que seleccionaste el correcto del menú Herramientas > Puerto Serial?
	at processing.app.Serial.<init>(Serial.java:191)
	at processing.app.Serial.<init>(Serial.java:77)
	at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:77)
	at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:172)
	at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:67)
	at processing.app.Sketch.upload(Sketch.java:1706)
	at processing.app.Sketch.exportApplet(Sketch.java:1662)
	at processing.app.Sketch.exportApplet(Sketch.java:1634)
	at processing.app.Editor$DefaultExportHandler.run(Editor.java:2346)
	at java.lang.Thread.run(Thread.java:722)

Some of the output is in Spanish because I'm Spanish (thank u captain obvious). I don't know how to solve it. May u help me? Thanks

Solved by a symlink (ln ttyACM0 ttyUSB0) and executing the arduino IDE as root