Hi, I made my first Opigno Installation. The initial installation and configuration was fine. Opigno LMS v1.27 It was installed in a Linode server with 1GB RAM (PHP Memory Limit 512MB) Opigno LMS (opigno_lms-7.x-1.27) PHP 7.1.4-1+deb.sury.org~xenial+1 Server nginx/1.11.9 DB 5.5.5-10.1.22-MariaDB-1~xenial When I try to post a new Forum Post (/node/add/forum/1) I got a drupal error: The website encountered an unexpected error. Please try again later. If I check the server reports I find 3 warnings/errors: Warning: Illegal string offset 'und' in drupal_array_set_nested_value() (line 6776 of /serverpath/public/includes/common.inc) Error: Cannot create references to/from string offsets in drupal_array_set_nested_value() (line 6776 of /serverpath/public/includes/common.inc) Missing text format: filtered_html I tested other options of Opigno without problems (I can create users, courses, lessons, upload scorm, polls, etc.). But the forums doesn't work. In the same server a clear standard Drupal 7.56 with advanced forums installed works flawless. Can you help me please?