processing.app.debug.RunnerException: This exception has no message.

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jssc.SerialPortException: Port name - /dev/ttyACM0; Method name - openPort(); Exception type - Port busy.
at jssc.SerialPort.openPort(SerialPort.java:164)
at processing.app.Serial.touchForCDCReset(Serial.java:81)
at cc.arduino.packages.uploaders.SerialUploader.uploadUsingPreferences(SerialUploader.java:130)
at cc.arduino.UploaderUtils.upload(UploaderUtils.java:78)
at processing.app.Sketch.upload(Sketch.java:1186)
at processing.app.Sketch.exportApplet(Sketch.java:1160)
at processing.app.Sketch.exportApplet(Sketch.java:1132)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2381)
at java.lang.Thread.run(Thread.java:745)

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