Bug 132914 "Invalid page number" error message is hard coded.
"Invalid page number" error message is hard coded in DocumentProcessor.java. This must be externalized into *.properties file. If there are other hard coded error messages, please also externalize.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
* @return IReportRunnable
	 * @throws EngineException
	 */
	synchronized public IReportRunnable openReportDesign(
			InputStream reportStream ) throws EngineException
	{
		return engine.openReportDesign( reportStream );
	}
	/**
	 * createGetParameterDefinitionTask.
	 * 
	 * @param runnable
	 * @return
	 */
	public IGetParameterDefinitionTask createGetParameterDefinitionTask(
			IReportRunnable runnable )
	{
		IGetParameterDefinitionTask task = null;
		try
		{
			synchronized ( this.getClass( ) )
			{
				task = engine.createGetParameterDefinitionTask( runnable );
			}
		}
		catch ( Exception e )
		{
		}
		return task;
	}