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
ChartException.GENERATION,
					"exception.unset.label.visibility", 
					new Object[]{
						la.getCaption( ).getValue( )
					},
					Messages.getResourceBundle( rtc.getULocale( ) ) );
		}
		if ( !la.isVisible( ) || !isAxisLabelStaggered( ) )
		{
			return 0;
		}
		String sText;
		double[] da = getTickCordinates( );
		if ( iOrientation == VERTICAL )
		{
			double dW, dMaxW = 0;
			if ( ( getType( ) & TEXT ) == TEXT || bCategoryScale )
			{
				final DataSetIterator dsi = getData( );
				final int iDateTimeUnit = ( getType( ) == IConstants.DATE_TIME ) ? CDateTime.computeUnit( dsi )
						: IConstants.UNDEFINED;
				dsi.reset( );
				int i = 0;
				while ( dsi.hasNext( ) )
				{
					la.getCaption( ).setValue( formatCategoryValue( getType( ),
							dsi.next( ),
							iDateTimeUnit ) );
					if ( !baTickLabelStaggered[i] )
					{