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java.lang.IllegalArgumentException: Argument cannot be null	at org.eclipse.swt.SWT.error(SWT.java:4258)	at org.eclipse.swt.SWT.error(SWT.java:4192)	at org.eclipse.swt.SWT.error(SWT.java:4163)	at org.eclipse.swt.dnd.DND.error(DND.java:281)	at org.eclipse.swt.dnd.DND.error(DND.java:227)