Uncaught exception thrown in session handler.

PDOException: SQLSTATE[HY000]: General error: 1290 El servidor MariaDB está rodando con la opción --read-only tal que no puede ejecutar este comando: INSERT INTO {sessions} (sid, ssid, uid, cache, hostname, session, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6); Array ( [:db_insert_placeholder_0] => LewBDYUUrjIevJ3idtG1UrOarAQ7pTZCWVokMcfOGNQ [:db_insert_placeholder_1] => LewBDYUUrjIevJ3idtG1UrOarAQ7pTZCWVokMcfOGNQ [:db_insert_placeholder_2] => 0 [:db_insert_placeholder_3] => 0 [:db_insert_placeholder_4] => 3.231.226.211 [:db_insert_placeholder_5] => messages|a:1:{s:5:"error";a:12:{i:0;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">29</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:1;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">31</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:2;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">29</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:3;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">31</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:4;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">29</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:5;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">31</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:6;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">29</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:7;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">31</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:8;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">29</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:9;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">31</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:10;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">29</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";i:11;s:290:"<em class="placeholder">Notice</em>: Undefined variable: field_link in <em class="placeholder">include()</em> (line <em class="placeholder">31</em> of <em class="placeholder">/var/www/biblioteca/public_html/sites/all/themes/utn_lx/templates/paragraphs-item--digital-libraries.tpl.php</em>).";}} [:db_insert_placeholder_6] => 1573546619 ) in _drupal_session_write() (line 209 of /var/www/biblioteca/public_html/includes/session.inc).