pui-info-buffer fails

This bug report will be sent to the XEmacs Development Team, not to your local site managers!! Please write in English, because the XEmacs maintainers do not have translators to read other languages for them. In XEmacs 21.4 (patch 1) "Copyleft" [Lucid] (i686-pc-linux, Mule) of Fri Apr 20 2001 on iqara configured using `configure --with-pop --with-xim=xlib --with-site-lisp=yes --with-mule --memory-usage-stats' Please describe exactly what actions triggered the bug and the precise symptoms of the bug: I get an error message when I try the command M-x pui-list-packages. The backtrace: Signaling: (wrong-type-argument stringp nil) expand-file-name(nil) package-get-update-base(nil t) package-get-require-base(t) #<compiled-function nil "...(137)" [pui-info-buffer pui-menu buffer-read-only sep-string start outbuf package-get-require-base t get-buffer-create "===============================================================================\n" nil message "Creating package list ..." sit-for 0 buffer-disable-undo erase-buffer kill-all-local-variables use-local-map list-packages-mode "Packages" "\nWarning: No download sites specified. Package index may be out of date.\n If you intend to install packages, specify download sites first.\n\n" " Latest Installed\n Package name Vers. Vers. Description\n" " Latest\n Package name Vers. Description\n" mapcar #<compiled-function ... "...(204)" ... 10> sort copy-sequence #<compiled-function ... "...(10)" ... 3> documentation set-buffer-modified-p pop-to-buffer delete-other-windows featurep menubar set-buffer-menubar add-submenu clear-message pui-display-keymap major-mode mode-name truncate-lines pa! ckage-get-remote pui-list-verbose package-get-base pui-selected-packages pui-deleted-packages current-menubar mode-popup-menu] 6 ("/usr/local/lib/xemacs-21.4.1/lisp/package-ui.elc" . 13400) nil>() call-interactively(pui-list-packages) Recent keystrokes: misc-user M-x d o c t o r RET C-x misc-user C-l C-x k RET M-x p u i SPC i n d BS s TAB RET M-x p u i TAB TAB button2 button2up C-h l next next next prior prior prior button1 button1up C-x 1 M-x d e b u g SPC o n SPC e TAB C-g M-x s e t SPC v a r i a b l e RET d e b u g SPC o n SPC e r r o r RET t RET misc-user button1 button1up M-x C-g misc-user Recent messages (most recent first): Parsing /home/wolk/.mailrc... Loading mail-abbrevs...done Loading mail-abbrevs... Loading emacsbug...done Quit Loading emacsbug... Entering debugger... Loading debug...done Loading debug... Quit Daniel Wolk