key mapping works in Gvim but not in vim

[Rugal]

Hello,
I don't know if this problem comes from my Vim or not, here is the problem description, if you find it has nothing to do with minibufexpl.vim, please close this issue, thx!

I have checked :noremap <C-Left>, :noremap <C>, :map <C-Left> as well as :map <C>, this key is not binded yet.
Minibufexpl works very well when I use MBEbn and bp command directly.
But When I configure in vimrc

noremap <C-Left> :MBEbp<CR>
noremap <C-Right> :MBEbn<CR>

It not works in vim and shows E388: Couldn't find definition but works good in Gvim for all kinds of key mapping.
When I check key mapping with map <C-Left> at this moment, Vim shows

<C-Left>   *  :MBEbp<CR>

Could you help me diagnose this problem?

[Rugal]

I don't know how to resolve this problem. But seems it is not the problem of minibufexpl.