Hello, I have installed koha 3.16.02 64bits on debian 7.x with 45,000 records, I have the following errors in the log opac-error.log more repeated the error are: Error #1 opac-detail.pl: Use of uninitialized value in concatenation (.) or string at /usr/share/koha/opac/cgi-bin/opac/opac-detail.pl line 957, <DATA> line 558. Error #2 opac-search.pl: Illegal date specified (year = 0, month = 0, day = 00) at /usr/share/koha/lib/C4/Search.pm line 1907 rror #2 Error #3 opac-detail.pl: Use of uninitialized value in concatenation (.) or string at /usr/share/koha/opac/cgi-bin/opac/opac-detail.pl line 957., referer: http://biblioteca.udd.cl/cgi-bin/koha/opac-search.pl?q=ccl=au%3ABosch%20Bousquet%2C%20Julio&sort_by=relevance_dsc&limit=au:Vargas%20Valdivia,%20Luis Thank you very much for your help -Carlos +569 6668 32 94