Errors when entering Mail/News groups

Running gnus-version "Gnus v5.6.4" under emacs-version "21.0 \"Russian White-pre7\" XEmacs Lucid (beta39)" started by use of editclient.sh I get backtraces like these when I try to enter a Mail/News group (via SPACE or RETURN): Regards, Adrian -- Adrian Aichner Applications Engineer Teradyne GmbH Semiconductor Test Group Telephone +49/89/41861(0)-208 Dingolfinger Straße 2 Fax +49/89/41861-217 D-81673 MÜNCHEN E-mail aichner(a)ecf.teradyne.com