Bug 135790 ClassCastException in RowData.
ClassCastException is thrown in RowData line 81(IBaseExpression expr = ( IBaseExpression ) valueExpressions.get( index - 1 );).
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
{
					Expression expression = new Expression( exprString );
					namedExpressions.put( name, expression );
				}
			}
		}
	}
	/**
	 * setup the master page object from the base master page handle.
	 * 
	 * @param page
	 *            page object
	 * @param handle
	 *            page handle
	 */
	private void setupMasterPage( MasterPageDesign page, MasterPageHandle handle )
	{
		setupStyledElement( page, handle );
		String styleName = setupBodyStyle( page );
		if (styleName != null)
		{
			page.setBodyStyleName( styleName );
		}
		page.setPageType( handle.getPageType( ) );
		
		DimensionValue effectWidth = handle.getEffectiveWidth( );
		DimensionValue effectHeight = handle.getEffectiveHeight( );
		DimensionType width = null;
		DimensionType height = null;
		if ( effectWidth != null )