Fix error message.
Fix error message.

niboshi/chainer,ktnyt/chainer,chainer/chainer,keisuke-umezawa/chainer,jnishi/chainer,okuta/chainer,rezoo/chainer,okuta/chainer,anaruse/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,ktnyt/chainer,aonotas/chainer,chainer/chainer,niboshi/chainer,cupy/cupy,cupy/cupy,jnishi/chainer,ronekko/chainer,chainer/chainer,ktnyt/chainer,wkentaro/chainer,cupy/cupy,hvy/chainer,keisuke-umezawa/chainer,ktnyt/chainer,hvy/chainer,okuta/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,hvy/chainer,jnishi/chainer,cupy/cupy,hvy/chainer,tkerola/chainer,niboshi/chainer,wkentaro/chainer,kiyukuta/chainer,ysekky/chainer,delta2323/chainer,niboshi/chainer,jnishi/chainer,wkentaro/chainer,pfnet/chainer,kashif/chainer