Vim - E490: No fold found

I'm having problems folding some lines in a LaTeX. I use the set foldmarker=/*,*/ option in my .vimrc, and is working fine in the main file, but when I change the buffer, in the other file, I can't fold the lines.

This is the main file. And this is the other file.

set foldmarker=/*,*/
set foldnestmax=10
set nofoldenable
set foldlevel=2
autocmd BufWinLeave *.* mkview
autocmd BufWinEnter *.* silent loadview

And that is what I have in my .vimrc to fold.

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