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See "Help improve this page" in the sidebar.</p></div></div></div> </div> </div> <div class="panel-separator"></div><div class="panel-pane pane-entity-field pane-node-body" > <div class="pane-content"> <div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>Sometimes, you can face an unexpected error in a Drupal website, for example during installation, development or updating:</p> <p><code class="language-php">The website encountered an unexpected error. Please try again later.</code></p> <p>You can enable backtracing of the error, and display of more information in the message area, via the GUI or by adding a single line in a settings file.</p> <h2 id="s-configure-debugging-via-browser"><a class="toc-anchor" title="Permalink to this headline" href="#s-configure-debugging-via-browser"></a>Configure debugging via browser</h2> <p>Navigate to Administration > Configuration > Development Logging and errors > Error messages to display (<em>/admin/config/development/logging</em>) and select the level of <strong>Error messages to display</strong> (config variable names added for reference):</p> <ul> <li>None - <code class="language-php">hide</code></li> <li>Errors and warnings - <code class="language-php">some</code></li> <li>All messages - <code class="language-php">all</code></li> <li>All messages, with backtrace information - <code class="language-php">verbose</code></li> </ul> <p>Click "Save configuration"</p> <h2 id="s-configure-debugging-via-drush"><a class="toc-anchor" title="Permalink to this headline" href="#s-configure-debugging-via-drush"></a>Configure debugging via Drush</h2> <p>You can enable debugging with Drush as well. See the four possible config variable names above:</p> <pre> <code class="language-php">drush config:set system.logging error_level verbose -y</code></pre><h2 id="s-configure-debugging-via-a-settings-file"><a class="toc-anchor" title="Permalink to this headline" href="#s-configure-debugging-via-a-settings-file"></a>Configure debugging via a settings file</h2> <p>Detailed backtracing and message level can also be enabled via a settings file, in one of two ways:</p> <ol> <li>Add it in a new <code class="language-php">settings.local.php</code> file, creating it by copying <code class="language-php">sites/example.settings.local.php</code> and rename it to <code class="language-php">sites/default/settings.local.php</code>. Make sure <code class="language-php">settings.local.php</code> file is loading by uncommenting the relevant lines in <code class="language-php">settings.php</code></li> <li>Add it in <code class="language-php">settings.php</code></li> </ol> <p>Add this:</p> <pre> <code class="language-php">$config['system.logging']['error_level'] = 'verbose';</code></pre><h2 id="s-enable-display-of-php-errors"><a class="toc-anchor" title="Permalink to this headline" href="#s-enable-display-of-php-errors"></a>Enable display of PHP errors</h2> <p>For local Drupal development, you can also enable error reporting, display errors and display startup error to help you further debugging and fixing major runtime errors:</p> <pre> <code class="language-php">error_reporting(E_ALL); ini_set('display_errors', TRUE); ini_set('display_startup_errors', TRUE);</code></pre></div></div></div> </div> </div> </div> </div> <div class="column-content-region bottom-right-content column panel-panel"> <div class="column-content-region-inner bottom-right-content-inner column-inner panel-panel-inner"> <div class="panel-pane pane-views-panes pane-documentation-help-improve-pane" id="help-improve-this-page" > <h2 class="pane-title"> Help improve this page </h2> <div class="pane-content"> <div class="view view-documentation-help view-id-documentation_help view-display-id-improve_pane view-dom-id-c4e5034796bccf1b8f7a78d301cf21d5"> <div class="view-content"> <div class="views-row views-row-1 views-row-odd views-row-first views-row-last"> <span class="views-field views-field-field-documentation-status"> <strong class="views-label views-label-field-documentation-status">Page status: </strong> <span class="field-content">Needs review</span> </span> <div class="views-field views-field-nothing"> <span class="field-content"><br /><strong>You can:</strong><br /> <ul> <li>Log in, click <a href="/node/3351554/edit">Edit</a>, and edit this page</li> <li>Log in, click <a href="/node/3351554/discuss">Discuss</a>, update the Page status value, and suggest an improvement</li> <li>Log in and <a href="/node/add/project-issue/documentation?title=Suggestion%20for%3A%20%283351554%29%20Enable%20verbose%20error%20logging%20for%20better%20backtracing%20and%20debugging">create a Documentation issue</a> with your suggestion</li> </ul></span> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> <div class="container footer clearfix panel-panel"> <div class="container-inner footer-inner panel-panel-inner"> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div>  </div>  </div>  <div id="footer" role="contentinfo"> <div class="region region-footer"> <div id="block-drupalorg-documentation-license" class="block block-drupalorg"> <div class="block-inner"> <div class="content"> Drupal’s online documentation is © 2000-2024 by the individual contributors and can be used in accordance with the <a href="/terms">Creative Commons License, Attribution-ShareAlike 2.0</a>. 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