Floating window error

[ghost]

vim version ：Vim82

Configuration information:
let g:ale_floating_preview = 1
let g:ale_hover_to_floating_preview = 1
let g:ale_detail_to_floating_preview = 1
let g:ale_use_global_executables = 1
let g:float_preview#docked = 0
let g:ale_cursor_detail = 1
let g:ale_hover_cursor = 1
let g:ale_close_preview_on_insert = 1

I want to use floating window in vim82, but it doesn't work，why ？

[hsanson]

Floating windows is a Neovim only feature.