macvim can not fold code "E490: No fold found" - vim

Question

I can not fold my code in macvim
my environment and settings is at the gist link https://gist.github.com/poc7667/7035979
is there any idead ?
hi Comment ctermfg=6
"function SetCafeOptions()
"CoffeeCompile
":set nonu
":res -24
":res +24
"endfunction
set encoding=utf-8
set fileencoding=utf-8
colorscheme elflord
set smartindent
set tabstop=4
set expandtab
set shiftwidth=4
"make it autoreload
set autoread
"auto move it last time the position you viewed
"make vim save and load the folding of the document each time it loads"
""also places the cursor in the last place that it was left."
"try to set show ansi color
if &term=="ansi"
set t_Co=0
endif
"set expandtab
filetype on
if has("cscope")
set csprg=/usr/bin/cscope
set csto=0
set cst
set nocsverb
" add any database in current directory
if filereadable("cscope.out")
cs add cscope.out
" else add database pointed to by environment
elseif $CSCOPE_DB != ""
cs add $CSCOPE_DB
endif
set csverb
set cscopetag
set cscopequickfix=s-,g-,c-,d-,t-,e-,f-,i-
endif
"let Tlist can close windows at one time
let Tlist_Show_One_File=1
let Tlist_Exit_OnlyWindow=1
" Key map
" Presee F4 and you can open the NERDTree
nnoremap <silent> <F4> :NERDTree<CR>
"nnoremap <silent> <F3> :!/usr/bin/env python %<CR>
" Show function List with Tlist
nnoremap <F12> :TlistToggle<CR>
" Map ctrl+q to ctrlw+ctrlw
"
"nnoremap <silent> <C-q> :<C-w><C-w>
"switch in splitted window
map <c-d> <c-w>l
map <c-a> <c-w>h
"set highlight
set hlsearch
"set autocomplet
"autocmd BufNewFile,BufRead *.html.erb set filetype=html.eruby
autocmd BufNewFile,BufRead *.html.erb set filetype=erb.html.eruby
filetype plugin on
"auto import python template
autocmd bufnewfile *.py 0r ~/common_lib/python/tmpl.py
map gn :bn<cr>
map gp :bp<cr>
map ff :CtrlP<cr>
map gt :buffers<cr>
"set NerdTreeSize
let g:NERDTreeWinSize=12
"auto close the nerdtress window whe you open new file
let g:ctrlp_dont_split = 'nerdtree'
set nocompatible " explictly get out of vi-compatible mode
set background=dark " we plan to use a dark background
syntax on " syntax highlighting on
set number " turn on line numbers
set wildignore+=*/test/*,*/tmp/*,*.so,*.swp,*.zip " MacOSX/Linux
set ruler "always show current position along the bottom
set incsearch " do highlight as you type you search phrase
set ignorecase " case insensitive by default
set smartcase " if there are caps, go case-sensitive
"Rope vim
let $PYTHONPATH .= ":~/install/ropehg/rope:~/install/ropehg/ropemode:~/install/ropehg/ropevim"
source ~/install/ropehg/ropevim/ropevim.vim
let g:pymode_rope_goto_def_newwin = "new"
let ropevim_vim_completion=1
"Use Ctrl + ] . to autocomple
inoremap <C-]> <C-R>=RopeCodeAssistInsertMode()<CR>
map <leader>j :RopeGotoDefinition<CR>
map <leader>r :RopeRename<CR>
" Load the whole plugin
let g:pymode = 1
" Load run code plugin
let g:pymode_run = 1
"add ctrlp.vim setting
""
let g:ctrlp_custom_ignore = 'tmp$\|\.git$\|\.hg$\|\.svn$\|.rvm$'
let g:ctrlp_working_path_mode = 'ra'
let g:ctrlp_match_window_bottom=1
let g:ctrlp_max_height=15
let g:ctrlp_match_window_reversed=0
let g:ctrlp_mruf_max=500
let g:ctrlp_follow_symlinks=1
"Vundle
set rtp+=~/.vim/bundle/vundle/
call vundle#rc()
Bundle 'gmarik/vundle'
Bundle 'tpope/vim-surround'
Bundle 'Raimondi/delimitMate'
"coffee script"
Bundle 'kchmck/vim-coffee-script'
Bundle 'ack.vim'
Bundle 'matchit.zip'
"Markdown"
"Bundle 'plasticboy/vim-markdown'
""Vim-scripts repo
Bundle 'The-NERD-Commenter'
Bundle 'pep8'
""Bundle 'AutoClose'
filetype plugin indent on
nmap <leader>a <Esc>:Ack ""
"folding code
nnoremap <space> za
vnoremap <space> zf
" pep8
let g:pep8_map='<leader>8'
"coffee script"
call pathogen#infect()
"make vim save and load the folding of the document each time it loads"
""also places the cursor in the last place that it was left."
au BufWinLeave *.* mkview
au BufWinEnter *.* silent loadview
let Tlist_Use_Right_Window = 1
"autocmd BufEnter * if &filetype == "" | setlocal ft=python | endif
"markdown https://github.com/plasticboy/vim-markdown/wiki"
"let g:vim_markdown_folding_disabled=1
"auto exec ruby and coffee script with F5 , remeber to save file before launching
autocmd FileType python map <leader>p :!python %<cr>
autocmd FileType ruby,rb map <leader>5 :w!<cr>:!ruby %<cr>
autocmd FileType * map <leader>e :qa!<cr>
"autocmd FileType coffee nmap <F5> :CoffeeCompile<cr>
"autocmd FileType coffee map <F5> :call SetCafeOptions()<cr>
so ~/.vim/snippets/support_functions.vim

Answer 1

Your .vimrc doesn't actually enable folding anywhere. Folding is not enabled by default. You need to tell Vim what method to use to fold your code.
What method you use might depend on what type of code you are editing. SOME syntax highlighting files define syntax-based folding. Other syntax files do not. If your code is of a type that supports syntax-based folding, then you can :setlocal foldmethod=syntax after loading the file. You can do this in an autocmd in your .vimrc if you like, for example autocmd FileType c setlocal foldmethod=syntax or you can do it manually.
Other automatic fold methods include "marker", "expr", and "indent". By default the fold method is "manual" and you must first create folds with zf in order to use folding commands.
See http://vim.wikia.com/wiki/Folding for a more detailed discussion.

Answer 2

Removing these lines solve the folding problem for me:
au BufWinLeave *.* mkview
au BufWinEnter *.* silent loadview