Couple of Warnings

Any Idea here?

After clicking export it says:

Your database (SQL) file has been successfully generated. Your download should begin any second.

After that a site with a lot of Warning appears:

Warning: set_time_limit() [function.set-time-limit]: Cannot set time limit in safe mode in /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php on line 771

Warning: Cannot modify header information – headers already sent by (output started at /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php:771) in /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php on line 775

Warning: Cannot modify header information – headers already sent by (output started at /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php:771) in /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php on line 776

Warning: Cannot modify header information – headers already sent by (output started at /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php:771) in /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php on line 777

Warning: Cannot modify header information – headers already sent by (output started at /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php:771) in /var/www/web4/html/wp-content/plugins/wp-migrate-db/wp-migrate-db.php on line 778

Thats strange!

https://wordpress.org/plugins/wp-migrate-db/