hi,
i get an irritating issue with my arduino uno, connected via usb.
whenever i run a sketch that uses the serial monitor to view the outcome, i can program the arduino once, but then i get COM6 not found error the next time i try.
changing usb ports doesn't free it up, and the only way i can find to solve it it to reboot the machine.
the full error
processing.app.SerialNotFoundException: Serial port 'COM6' not found. Did you select the right one from the Tools > Serial Port menu?
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:619)