Warning: main(language/lang-.php): failed to open stream: No such file or directory

[pistoleta]

este mensaje me sale despues de haber subido el backup de la base de datos al nuevo host y haber configurado el config.php...

Código:

Warning: main(language/lang-.php): failed to open stream: No such file or directory in /var/www/vhost/xaveos.com/home/html/mainfile.php on line 196

Warning: main(): Failed opening 'language/lang-.php' for inclusion (include_path='.:/usr/share/pear') in /var/www/vhost/xaveos.com/home/html/mainfile.php on line 196

Warning: head(themes//theme.php): failed to open stream: No such file or directory in /var/www/vhost/xaveos.com/home/html/header.php on line 31

Warning: head(): Failed opening 'themes//theme.php' for inclusion (include_path='.:/usr/share/pear') in /var/www/vhost/xaveos.com/home/html/header.php on line 31

Fatal error: Call to undefined function: themeheader() in /var/www/vhost/xaveos.com/home/html/header.php on line 51

no se que hacer he probado a volver a subir la base de datos pero me sigue surgiendo lo mismo, alguien me puede decir que diablos ocurre??

gracias