[Koha] conflicting charset

[robin ros]

hello everyone,

I had a problem with my spanish translation, i downloaded the latest
.po archive from cvs and i wanted to install but give an error, i
think this is the command:

./tmpl_process3.pl install -i
/usr/local/koha/opac/htdocs/opac-tmpl/css/en/ -o
/usr/local/koha/opac/htdocs/opac-tmpl/css/es/ -s /opt/po-es/opac_es.po
-r

but give this error:

Conflicting charsets in msgid: <!-- vs UTF-8

my system work fine with utf-8, and i donot know how to fix this
error, has someone had this problem??,

any help is welcome,

thanks for your help,

robin