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This is a bug in some versions of the Arduino IDE. Try updating to the version 1.6.12 or further.
Provide a working directory instead of pointing it to a file or an empty directory in process builder.
Solutions on the web
java.io.IOException: Cannot run program "/usr/local/bin/bash": CreateProcess error=2, The system cannot find the file specified
at java.lang.ProcessBuilder.start(Unknown Source)