[Koha] some warnings during zebra indexing

Hi, I've these following warnings while indexing. /15:45:36-05/02 zebraidx(29319) [warn] /etc/koha/zebradb/authorities/etc/dom-config-marc.xml: stylesheet authority-zebra-indexdefs.xsl not found in path /etc/koha/zebradb/authorities/etc:/etc/koha/zebradb/etc:/etc/koha/zebradb/marc_defs/unimarc/authorities:/etc/koha/zebradb/lang_defs/fr:/etc/koha/zebradb/xsl 15:45:36-05/02 zebraidx(29319) [warn] /etc/koha/zebradb/authorities/etc/dom-config-marc.xml: stylesheet authority-zebra-indexdefs.xsl not found in path /etc/koha/zebradb/authorities/etc:/etc/koha/zebradb/etc:/etc/koha/zebradb/marc_defs/unimarc/authorities:/etc/koha/zebradb/lang_defs/fr:/etc/koha/zebradb/xsl / How can i solve these problem? best regards, samuel