error to expor

when i try to expor to cvs release this mesagge.

Warning: mysql_num_fields() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 113

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php:113) in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 138

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php:113) in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 139

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php:113) in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 140

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php:113) in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 141

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php:113) in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 142

Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php:113) in C:\xampp\htdocs\gestores\wp-content\plugins\wp-csv-to-database\main.php on line 143