just for information!
after update to libreoffice-6.0.2.1-1.2.i586, writer issues failure messages looking for files,
dialog.xlb Module1.xba script.xlb
in
$HOME/.config/libreoffice/4/user/basic/Standard/
these file are to be found in
/usr/lib/libreoffice/presets/basic/Standard/
copying the files to $HOME/.config/libreoffice/4/user/basic/Standard/ and
changing ownership to the user eliminated the messages