[21.0-b40] (wrong-type-argument sequencep 2)

I just got this trying to send mail from within Gnus. I did update the required package (xemacs-base) prior to using this beta. Signaling: (wrong-type-argument sequencep 2) start-itimer("lazy shot for *mail*" lazy-shot-stealth-lock 30 30 t t #<buffer "*mail*">) lazy-shot-install-timer(t) lazy-shot-install() lazy-shot-mode(t) turn-on-lazy-shot() run-hooks(turn-on-lazy-shot) font-lock-mode(1) turn-on-font-lock() font-lock-set-defaults() message-xmas-maybe-fontify() run-hooks((lambda nil (turn-on-auto-fill) (turn-on-filladapt-mode) (setq fill-column 70)) message-xmas-maybe-fontify) message-mode() message-pop-to-buffer("*mail*") message-mail() #<compiled-function nil "...(71)" [current-window-configuration buffer-name gnus-article-reply get-text-property gnus-intangible to gnus-summary-goto-subject gnus-number gnus-summary-last-subject gnus-newsgroup-name copy-sequence message-header-setup-hook gnus-setup-message-group gnus-setup-message-article gnus-setup-message-buffer gnus-setup-message-winconf add-hook gnus-inews-insert-gcc gnus-inews-insert-archive-gcc (...) message-mail gnus-configure-windows message t set-buffer-modified-p nil] 7 ("/data/mdb/gnu/lib/xemacs/packages/lisp/gnus/gnus-msg.elc" . 6380) nil>() call-interactively(gnus-group-mail)