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java.lang.NullPointerException: 	at org.pentaho.di.core.logging.Log4jKettleLayout.format(Log4jKettleLayout.java:62)	at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:150)	at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:161)	at org.pentaho.di.core.logging.Log4jBufferAppender.getBuffer(Log4jBufferAppender.java:157)	at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog.doPreview(TransPreviewProgressDialog.java:227)	at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog.access$000(TransPreviewProgressDialog.java:47)	at org.pentaho.di.ui.trans.dialog.TransPreviewProgressDialog$1.run(TransPreviewProgressDialog.java:80)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:113)