[Error] attempting to list required packages of uninstalled package

I don't have the gnus package installed because I use site-packages/pgnus-0.67. In *Packages*, selecting gnus and then typing r r runs `pui-add-required-packages' leads following *Backtrace*: Signaling: (wrong-type-argument number-char-or-marker-p nil) <(nil 1.08) (if (< (if ... ... installed) (if ... ... current)) pkg nil) ) (let ((installed ...) (current ...)) (if (< ... ...) pkg nil)) ) (lambda (pkg) (let (... ...) (if ... pkg nil)))(rmail) mapcar((lambda (pkg) (let (... ...) (if ... pkg nil))) (xemacs-base mail-lib rmail mailcrypt mh-e w3 apel tm vm fsf-compat)) (delq nil (mapcar (lambda ... ...) (package-get-dependencies pui-selected-packages))) ) (let ((dependencies ...)) (save-window-excursion (with-output-to-temp-buffer tmpbuf ...) (setq tmpbuf ...) (display-buffer tmpbuf) (setq do-select ...) (kill-buffer tmpbuf)) (if do-select (progn ... ... ...) (clear-message))) ) (if pui-selected-packages (let (...) (save-window-excursion ... ... ... ... ...) (if do-select ... ...)) (error "No packages have been selected!")) ) (let ((tmpbuf "*Required-Packages*") do-select) (if pui-selected-packages (let ... ... ...) (error "No packages have been selected!"))) ) (lambda nil "Select packages required by those already selected for installation." (interactive) (let (... do-select) (if pui-selected-packages ... ...)))() call-interactively(pui-add-required-packages) -- Adrian Aichner Teradyne GmbH, European Design Center Integra Test Division Telephone +49/89/41861(0)-208 Dingolfinger Strasse 2 Fax +49/89/41861-217 (What is a Fax?) D-81673 MUENCHEN E-mail adrian.aichner(a)teradyne.com