Broken backend

Hi, if I want edit existing page/post or create one this errors shows:

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2119

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2134

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2143

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2119

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2134

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2143

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2719

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2729

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2738

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2755

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2782

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2786

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2790

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2794

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2830

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2719

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2729

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2738

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2755

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2782

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2786

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2790

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2794

Warning: Undefined array key "type" in /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php on line 2830

Warning: Cannot modify header information - headers already sent by (output started at /data/web/virtuals/314931/virtual/www/wp-includes/rest-api.php:2119) in /data/web/virtuals/314931/virtual/www/wp-admin/admin-header.php on line 9

If I deactivate GB 1.7.2, errors disapiers. Any suggestions ? Whats going on ? Thanx