No highlighting in VIM!!!!

[zhwalker]

Suddenly an error happend to my VIM compiler. There is no highlighting in my text and the code":syntax enable" gets the follwing message:
Error detected while processing /usr/share/vim/vim70/syntax/syntax.vim:
line 42:
E216: No such group or event: filetypedetect BufRead
And the content of my syntax.vim file as follows:
" Vim syntax support file
" Maintainer: Bram Moolenaar <Bram@vim.org>
" Last Change: 2001 Sep 04

" This file is used for ":syntax on".
" It installs the autocommands and starts highlighting for all buffers.

if !has("syntax")
finish
endif

" If Syntax highlighting appears to be on already, turn it off first, so that
" any leftovers are cleared.
if exists("syntax_on") || exists("syntax_manual")
so <sfile>:p:h/nosyntax.vim
endif

" Load the Syntax autocommands and set the default methods for highlighting.
runtime syntax/synload.vim

" Load the FileType autocommands if not done yet.
if exists("did_load_filetypes")
let s:did_ft = 1
else
filetype on
let s:did_ft = 0
endif

" Set up the connection between FileType and Syntax autocommands.
" This makes the syntax automatically set when the file type is detected.
augroup syntaxset
au! FileType * exe "set syntax=" . expand("<amatch>")
augroup END


" Execute the syntax autocommands for the each buffer.
" If the filetype wasn't detected yet, do that now.
" Always do the syntaxset autocommands, for buffers where the 'filetype'
" already was set manually (e.g., help buffers).
doautoall syntaxset FileType
if !s:did_ft
doautoall filetypedetect BufRead
endif



My G＋＋ ersion is ：
VIM - Vi IMproved 7.0 (2006 May 7, compiled May 12 2006 08:03:4Cool
Included patches: 1-10
How can i solve this problem?
Pls help me!!!!!!!