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java.lang.IllegalStateException: /path/to/log/dir/2010/2010_12/2010_12_08/file.log should not have existing parent directory	at ch.qos.logback.core.util.FileUtil.createMissingParentDirectories(	at ch.qos.logback.core.FileAppender.openFile(	at ch.qos.logback.core.FileAppender.start(