wont reflach prom keeps giving eror

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here problem tried upload program , keeps giving me

arduino: 1.5.7 (mac os x), board: "arduino micro"

sketch uses 4,800 bytes (16%) of program storage space. maximum 28,672 bytes.
global variables use 157 bytes (6%) of dynamic memory, leaving 2,403 bytes local variables. maximum 2,560 bytes.
processing.app.debug.runnerexception: couldn't find board on selected port. check have correct port selected.  if correct, try pressing board's reset button after initiating upload.
   at cc.arduino.packages.uploaders.serialuploader.waitforuploadport(serialuploader.java:197)
   at cc.arduino.packages.uploaders.serialuploader.uploadusingpreferences(serialuploader.java:91)
   at processing.app.sketch.upload(sketch.java:1714)
   at processing.app.sketch.exportapplet(sketch.java:1625)
   at processing.app.sketch.exportapplet(sketch.java:1597)
   at processing.app.editor$defaultexporthandler.run(editor.java:2397)
   at java.lang.thread.run(thread.java:745)

  report have more information with
  "show verbose output during compilation"
  enabled in file > preferences.

what post comes when plug in? bring terminal window, try dmesg, plug in , run dmesg again.


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