Bug 317267 [Automation][Regression]Error is thrown out when preview gantt type chart
chart/org.eclipse.birt.chart.engine.extension/src/org/eclipse/birt/chart/extension/datafeed/GanttDataSetProcessorImpl.java
ds.setValues( gea );
			}
		}
		else
		{
			throw new ChartException( ChartEngineExtensionPlugin.ID,
					ChartException.DATA_SET,
					"exception.unknown.custom.dataset",
					new Object[]{
							ds, oResultSetDef
					},
					Messages.getResourceBundle( getULocale( ) ) );
		}
		return ds;
	}
	private void validateGanttEntryData( Object[] obja ) throws ChartException
	{
		boolean valid = true;
		if ( obja == null )
		{
			valid = false;
		}
		else if ( obja.length != 3 )
		{
			throw new ChartException( ChartEngineExtensionPlugin.ID,
					ChartException.DATA_SET,
					"exception.dataset.ganttseries",
					Messages.getResourceBundle( getULocale( ) ) );
		}
		else