Bug 152898 Error Bar Chart
Version: 3.2.0 Build id: I20060602-1317 The option of chart sometimes works ok, but sometimes it has the following error:
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/computation/withaxes/AutoScale.java
}
		return nTicks;
	}
	/**
	 * Returns the absolute value of the scale unit.
	 * 
	 * @return
	 */
	public final double getUnitSize( )
	{
		if ( daTickCoordinates == null )
		{
			throw new RuntimeException( new ChartException( ChartEnginePlugin.ID,
					ChartException.COMPUTATION,
					"exception.unit.size.failure",  
					Messages.getResourceBundle( rtc.getULocale( ) ) ) );
		}
		return Math.abs( daTickCoordinates[1] - daTickCoordinates[0] );
	}
	/**
	 * 
	 * @return
	 */
	public final Object getMinimum( )
	{
		return oMinimum;
	}
	/**
	 * @param o
	 */