<S-Tab>key (<grv-prev-view>) doesn't work

[c02y]

I don't know whether this is my own problem, but <S-Tab> key dones't work as expected, it doesn't call <grv-prev-view> which is the default binding according to https://github.com/rgburke/grv/blob/master/doc/documentation.md, even I put the following line into grvrc

map All <S-Tab> <grv-prev-view>