A transit official says a mistake in an application for federal funds may mean the elimination of an express bus route that carries 25,000 passengers a year between Lake Tahoe's south shore and downtown Carson City. The Valley and Lake Express route "21x" is at risk of ending due to what Tahoe Transportation District manager Carl Hasty says was a beneficial funding change with unintended consequences. According to Hasty, information about the district's density was omitted by mistake. The result has cost a significant loss of funding. The district is asking the state transportation department to step in and fund the route.