404. That’s an error.

The requested URL /custom?q=NERD_tree.vim&safe=active&client=pub-3005259998294962&cof=FORID:13%3BAH:left%3BS:http://www.vim.org%3BCX:Vim%2520Search%3BL:http://www.vim.org/images/vim_header.gif%3BLH:45%3BLC:%230000ff%3BVLC:%23663399%3BDIV:%23336699%3B&cx=partner-pub-3005259998294962:bvyni59kjr1&adkw=AELymgVLTLZ7rysfBuooTd2Yao8A4v4bs1kwFad873TzOz8f4WW_dJppZgz2tHf5-4VfSVWNW9Y5zU-1Tbm1mw0JCrd_ckB1IRZswuG9ypczeV3uCFqYzjnfs_67A4cKqMpKMw3xA2-c2jxR_nguXbOcScwMb6sAJ92glwlJDE3Yl0CMumzyYg4&hl=en&channel=7394275211&boostcse=0&ie=UTF-8&oe=ISO-8859-1&prmd=ivns&ei=oXy8Vq2SLcGDmQG_g7zoAw&start=50&sa=N was not found on this server. That’s all we know.