[racket] provide and require in submodules

Dear list members,

This works in DrRacket:
definitions window
-------------------------
#lang racket
(module+ server
(provide a-from-server)
(define a-from-server 'a-from-server))

(module+ client
(module server2 racket
(provide b-from-server2)
(define b-from-server2 'b-from-server2))

(require (submod ".." server))
(provide (all-from-out (submod ".." server)))

(require 'server2)
(provide (all-from-out (submod "." server2))))

(module+ main
(require (submod ".." client))
a-from-server
b-from-server2)

Results in interactions window
---------------
>
'a-from-server
'b-from-server2

BUT the following gives me the error: "all-from-out: no corresponding
require in: (quote server2)"
Could someone explain why I'm getting this error.

Definitions window
------------------
#lang racket
(module+ server
(provide a-from-server)
(define a-from-server 'a-from-server))

(module+ client
(module server2 racket
(provide b-from-server2)
(define b-from-server2 'b-from-server2))

(require (submod ".." server))
(provide (all-from-out (submod ".." server)))

(require 'server2)
(provide (all-from-out 'server2)))  ;;;CHANGED (submod "." server2) TO
'server2

(module+ main
(require (submod ".." client))
a-from-server
b-from-server2)

Thanks,
Harry Spier
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