Lots of errors after activating

Hello, I get these error messages after activating the account:

Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Notice: is_term is deprecated since version 3.0! Use term_exists() instead. in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php on line 3201 Warning: Cannot modify header information – headers already sent by (output started at /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-includes/functions.php:3201) in /mnt/webs/a1/49/54376249/htdocs/WordPress_02/wp-content/themes/MJ/framework/class/class_admin.php on line 417

There are several more errors when I try to configure the theme in the backend. Please help! Thanks!

My URL: shootingstarts.de