Error with export options

When I try to export my table to excel, word or any format, I get this error:
Warning: set_time_limit(): Cannot set time limit in safe mode in /home/httpd/vhosts/consejo25.org/httpdocs/php/run1.1/Datos_export.php on line 39
Warning: Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/domain.org/httpdocs/php/run1.1/Datos_export.php'>domain.org/httpdocs/php/run1.1/Datos_export.php:39'>domain.org/httpdocs/php/run1.1/Datos_export.php'>domain.org/httpdocs/php/run1.1/Datos_export.php:39) in /home/httpd/vhosts/domain.org/httpdocs/php/run1.1/Datos_export.php'>domain.org/httpdocs/php/run1.1/Datos_export.php on line 106
Warning: Cannot modify header information - headers already sent by (output started at /home/httpd/vhosts/domain.org/httpdocs/php/run1.1/Datos_export.php'>domain.org/httpdocs/php/run1.1/Datos_export.php:39'>domain.org/httpdocs/php/run1.1/Datos_export.php'>domain.org/httpdocs/php/run1.1/Datos_export.php:39) in /home/httpd/vhosts/domain.org/httpdocs/php/run1.1/Datos_export.php'>domain.org/httpdocs/php/run1.1/Datos_export.php on line 107

id trimestre ano consejo pais coorgen coor delgen delequip delgrup local hb ejemhb adh ph lc cc

5 03 2005 Alfa Dinamarca 1 1 1 1 1 1 11 1 11 1 1

3 03 2005 Delta Ecuador 0 0 0 0 888 0 0 0 0 0 0

Where could be the problem?

Thanks

Luigi