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    Expert tip

    This is a bug in some versions of the Arduino IDE. Try updating to the version 1.6.12 or further.

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    Provide a working directory instead of pointing it to a file or an empty directory in process builder.

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via esp8266.com by Unknown author, 1 year ago
This exception has no message.
java.io.IOException: 	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)	at processing.app.helpers.ProcessUtils.exec(ProcessUtils.java:26)