I have just bought and installed the Terra theme, and disable almost all plugins, but my wordpress makes errors when I use your theme – both backend and frontend.

Can you see from this error code, what is wrong?
site: neming .dk
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return value of new by reference is deprecated in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/option-tree/ot-loader.php on line 389 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/option-tree/includes/ot-settings-api.php on line 847 Deprecated: Assigning the return value of new by reference is deprecated in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/option-tree/includes/ot-meta-box-api.php on line 279 Strict Standards: Declaration of boc_Menu_Walker::start_el() should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 121 Strict Standards: Declaration of boc_Menu_Select_Walker::start_lvl() should be compatible with Walker_Nav_Menu::start_lvl(&$output, $depth = 0, $args = Array) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 144 Strict Standards: Declaration of boc_Menu_Select_Walker::end_lvl() should be compatible with Walker_Nav_Menu::end_lvl(&$output, $depth = 0, $args = Array) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 144 Strict Standards: Declaration of boc_Menu_Select_Walker::start_el() should be compatible with Walker_Nav_Menu::start_el(&$output, $item, $depth = 0, $args = Array, $id = 0) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 144 Strict Standards: Declaration of boc_Menu_Select_Walker::end_el() should be compatible with Walker_Nav_Menu::end_el(&$output, $item, $depth = 0, $args = Array) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 144 Strict Standards: Declaration of boc_Menu_Select_Fallback_Walker::start_lvl() should be compatible with Walker_Page::start_lvl(&$output, $depth = 0, $args = Array) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 168 Strict Standards: Declaration of boc_Menu_Select_Fallback_Walker::end_lvl() should be compatible with Walker_Page::end_lvl(&$output, $depth = 0, $args = Array) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 168 Strict Standards: Declaration of boc_Menu_Select_Fallback_Walker::start_el() should be compatible with Walker_Page::start_el(&$output, $page, $depth = 0, $args = Array, $current_page = 0) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 168 Strict Standards: Declaration of boc_Menu_Select_Fallback_Walker::end_el() should be compatible with Walker_Page::end_el(&$output, $page, $depth = 0, $args = Array) in /var/www/vhosts/test.neming.dk/httpdocs/wp-content/themes/Terra/includes/boc_custom.php on line 168 Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Terra Sidebar” sidebar. Defaulting to “sidebar-1″. Manually set the id to “sidebar-1″ to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3996 Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Footer Widget 1″ sidebar. Defaulting to “sidebar-2″. Manually set the id to “sidebar-2″ to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3996 Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Footer Widget 2″ sidebar. Defaulting to “sidebar-3″. Manually set the id to “sidebar-3″ to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3996 Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Footer Widget 3″ sidebar. Defaulting to “sidebar-4″. Manually set the id to “sidebar-4″ to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3996 Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Footer Widget 4″ sidebar. Defaulting to “sidebar-5″. Manually set the id to “sidebar-5″ to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3996 Notice: register_sidebar was called incorrectly. No id was set in the arguments array for the “Terra Contact Sidebar” sidebar. Defaulting to “sidebar-6″. Manually set the id to “sidebar-6″ to silence this notice and keep existing sidebar content. Please see Debugging in WordPress for more information. (This message was added in version 4.2.0.) in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3996 Notice: The called constructor method for WP_Widget in boc_latest is deprecated since version 4.3.0! Use __construct()
instead. in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3767 Notice: The called constructor method for WP_Widget in contact_info_widget is deprecated since version 4.3.0! Use __construct()
instead. in /var/www/vhosts/test.neming.dk/httpdocs/wp-includes/functions.php on line 3767
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Best Regards
Henrik

These are just warning messages I think, you should always have them set to OFF on your working environments via your PHP server settings!