Debugger entered--Lisp error: (wrong-type-argument char-or-string-p nil)
  decode-coding-string(nil utf-8)
  nnimap-decode-gnus-group(nil)
  nnimap-request-accept-article(nil "UCMgmail" t)
  gnus-request-accept-article(nil (nnimap "UCMgmail" (nnimap-address "imap.gmail.com") (nnimap-server-port 993) (nnimap-authinfo-file "~/.authinfo") (nnimap-stream ssl)) t t)
  eval((gnus-request-accept-article nil (quote (nnimap "UCMgmail" ... ... ... ...)) t t))
  nnimap-request-move-article(19859 "INBOX" "UCMgmail" (gnus-request-accept-article nil (quote (nnimap "UCMgmail" ... ... ... ...)) t t) t nil)
  gnus-request-move-article(19859 "nnimap+UCMgmail:INBOX" "UCMgmail" (gnus-request-accept-article nil (quote (nnimap "UCMgmail" ... ... ... ...)) t t) t nil)
  gnus-summary-move-article(nil nil (nnimap "UCMgmail" (nnimap-address "imap.gmail.com") (nnimap-server-port 993) (nnimap-authinfo-file "~/.authinfo") (nnimap-stream ssl)))
  #<compiled-function (from gnus-summary-respool-article) (&optional n method) "...(32)" [gnus-newsgroup-name n method error "No method given for respooling" assoc symbol-name gnus-find-method-for-group gnus-methods-using respool gnus-summary-move-article nil gnus-summary-copy-article] 4 ("/home/oub/xemacs/site-lisp/packages/ma-gnus-09/lisp/gnus-sum.elc" . 293934) (list current-prefix-arg (let* ... ...)) 0x2f4b>(nil (nnimap "UCMgmail" (nnimap-address "imap.gmail.com") (nnimap-server-port 993) (nnimap-authinfo-file "~/.authinfo") (nnimap-stream ssl)))
  call-interactively(gnus-summary-respool-article)