Hello,

what this message means?

"NO Unknown subscription namespace."

the shared namespace is visible and I can fetch messages from it, but 
subscription fails with the above message.

(user002 is sharing the folder named docs-users002 with user user001)


# telnet localhost 143
Trying ::1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE 
AUTH=PLAIN] Dovecot ready.
. login user001 secret
. OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE SORT 
SORT=DISPLAY THREAD=REFERENCES THREAD=REFS MULTIAPPEND UNSELECT CHILDREN 
NAMESPACE UIDPLUS LIST-EXTENDED I18NLEVEL=1 CONDSTORE QRESYNC ESEARCH ESORT 
SEARCHRES WITHIN CONTEXT=SEARCH LIST-STATUS ACL RIGHTS=texk] Logged in
. list "shared." "*"
* LIST (\Noselect \HasChildren) "." "shared.user002"
. OK List completed.
. list "shared.user002." "*"
* LIST (\HasNoChildren) "." "shared.user002.docs-user002"
. OK List completed.
. list "shared.user002.docs-user002." "*"
. OK List completed.
. select "shared.user002.docs-user002"
* FLAGS (\Answered \Flagged \Deleted \Seen \Draft)
* OK [PERMANENTFLAGS (\Answered \Flagged \Deleted \Seen \Draft)] Flags 
permitted.
* 2 EXISTS
* 0 RECENT
* OK [UIDVALIDITY 1315765265] UIDs valid
* OK [UIDNEXT 3] Predicted next UID
* OK [HIGHESTMODSEQ 3] Highest
. OK [READ-WRITE] Select completed.
. fetch 1 all
* 1 FETCH (FLAGS (\Seen) INTERNALDATE "24-Nov-2009 11:58:34 +0100" RFC822.SIZE 
3734 ENVELOPE ("Tue, 24 Nov 2009 07:58:34 -0400 (AST)" "Thank you for 
registering for the Red Hat Virtual Experience" 
(("supp...@virtualevents365.com" NIL "support" "virtualevents365.com")) 
(("supp...@virtualevents365.com" NIL "support" "virtualevents365.com")) 
(("supp...@virtualevents365.com" NIL "support" "virtualevents365.com")) 
(("damocl...@hotmail.com" NIL "damocles-" "hotmail.com")) NIL NIL NIL 
"<6955854.2731259063914762.javamail.r...@app130.vs.int.cgsinc.ca>"))
. OK Fetch completed.
. subscribe "shared.user002.docs-user002"
. NO Unknown subscription namespace.
. logout
* BYE Logging out
. OK Logout completed.
Connection closed by foreign host.

     /----------------/

namespace {
  inbox = yes
  location = 
  prefix = INBOX.
  separator = .
  subscriptions = yes
}
namespace {
  list = yes
  location = maildir:/var/virtual-maildir/%%n
  prefix = shared.%%n.
  separator = .
  subscriptions = no
  type = shared
}

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