Debugger entered--Lisp error: (error "No such function: nnvirtual-request-list")
  signal(error ("No such function: nnvirtual-request-list"))
  cerror("No such function: %s" nnvirtual-request-list)
  apply(cerror "No such function: %s" nnvirtual-request-list)
  error("No such function: %s" nnvirtual-request-list)
  gnus-get-function((nnvirtual "^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)") request-list)
  gnus-request-list((nnvirtual "^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)"))
  gnus-browse-foreign-server("nnvirtual:^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)" #<buffer "*Server*">)
  #<compiled-function (from gnus-server-read-server) (server) "...(23)" [server buf gnus-browse-foreign-server nil gnus-server-update-server gnus-server-server-name gnus-server-position-point] 3 ("/home/oub/xemacs/site-lisp/packages/gnus-git-15-1-2013/lisp/gnus-srvr.elc" . 24839) (list (gnus-server-server-name)) 0x4155>("nnvirtual:^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)")
  call-interactively(gnus-server-read-server)
  recursive-edit()
  byte-code("..." [buffer-read-only noninteractive debugger-buffer middlestart debugger-args debugger-batch-max-lines pop-to-buffer debugger-mode debugger-setup-buffer count-lines 2 "...\n" message buffer-string kill-emacs debug backtrace-debug 3 t debugger-reenable "" nil recursive-edit standard-output] 3)
  debug(error (error "No such function: nnvirtual-request-list"))
  signal(error ("No such function: nnvirtual-request-list"))
  cerror("No such function: %s" nnvirtual-request-list)
  apply(cerror "No such function: %s" nnvirtual-request-list)
  error("No such function: %s" nnvirtual-request-list)
  gnus-get-function((nnvirtual "^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)") request-list)
  gnus-request-list((nnvirtual "^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)"))
  gnus-browse-foreign-server("nnvirtual:^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)" #<killed buffer>)
  #<compiled-function (from gnus-server-read-server) (server) "...(23)" [server buf gnus-browse-foreign-server nil gnus-server-update-server gnus-server-server-name gnus-server-position-point] 3 ("/home/oub/xemacs/site-lisp/packages/gnus-git-15-1-2013/lisp/gnus-srvr.elc" . 24839) (list (gnus-server-server-name)) 0x4155>("nnvirtual:^$\\|\\(^nnimap\\+UCMgmail:Josetxo$\\)\\|\\(^nnimap\\+UCMgmail:Roberto$\\)")
  call-interactively(gnus-server-read-server)