When I use the writeToLog() javascript method to write log message in error level, I got the below line in my log file,

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2010/07/23 11:39:00 - validate Record.0 - ERROR (version 3.2.0-GA, build 10572 from 2009-05-12 08.45.26 by buildguy) : My error message
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I found the version and build number (bolded) being inserted in my log messages. May I know how can I get rid of it ? Thank you !