Bug 178489 [Deployment]Error log isn't printed in log file when using framset set method[0601]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/RenderTask.java
{
				throw new EngineException(
						"Render options have to be specified to render a report." ); 
			}
			if ( runnable == null )
			{
				throw new EngineException(
						"Can not find the report design in the report document {0}.",
						new Object[]{reportDoc.getName( )} );
			}
			innerRender.render( );
		}
		finally
		{
			changeStatusToStopped( );
		}
	}
	/* (non-Javadoc)
	 * @see org.eclipse.birt.report.engine.api.IRenderTask#render()
	 */
	public void setPageNumber( long pageNumber ) throws EngineException
	{
		long totalPage = reportDoc.getPageCount( );
		if ( pageNumber <= 0 || pageNumber > totalPage )
		{
			throw new EngineException( "Page {0} is not found ", new Long( 
					pageNumber ) );
		}
		innerRender = new PageRender( pageNumber);
	}