newsupernova/vendor/magento/magento2-base/setup/view/error/404.phtml

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */

// @codingStandardsIgnoreFile

?>
<header class="header">
    <img class="logo" src="<?= $this->basePath() ?>/pub/images/magento-icon.svg" alt="Magento"/>
    <h1 class="header-title">A 404 error occurred</h1>
</header>

<h2>Page not found</h2>

<?php if ( isset( $this->reason ) && $this->reason ): ?>

    <?php
    $reasonMessage = '';
    switch ( $this->reason ) {
        case 'error-controller-cannot-dispatch':
            $reasonMessage = 'The requested controller was unable to dispatch the request.';
            break;
        case 'error-controller-not-found':
            $reasonMessage = 'The requested controller could not be mapped to an existing controller class.';
            break;
        case 'error-controller-invalid':
            $reasonMessage = 'The requested controller was not dispatchable.';
            break;
        case 'error-router-no-match':
            $reasonMessage = 'The requested URL could not be matched by routing.';
            break;
        default:
            $reasonMessage = 'We cannot determine at this time why a 404 was generated.';
            break;
    }
    ?>

    <p><?= $reasonMessage ?></p>

<?php endif ?>

<?php if ( isset( $this->controller ) && $this->controller ): ?>

    <dl>
        <dt>Controller:</dt>
        <dd><?= $this->escapeHtml( $this->controller ) ?>
            <?php
            if ( isset( $this->controller_class )
                 && $this->controller_class
                 && $this->controller_class != $this->controller
            ) {
                echo '(' . sprintf( 'resolves to %s', $this->escapeHtml( $this->controller_class ) ) . ')';
            }
            ?>
        </dd>
    </dl>

<?php endif ?>

<?php if ( isset( $this->display_exceptions ) && $this->display_exceptions ): ?>

    <?php if ( isset( $this->exception ) && $this->exception instanceof Exception ): ?>
        <hr/>
        <h2>Additional information:</h2>
        <h3><?= get_class( $this->exception ) ?></h3>
        <dl>
            <dt>File:</dt>
            <dd>
                <pre class="prettyprint linenums"><?= $this->exception->getFile() ?>:<?= $this->exception->getLine() ?></pre>
            </dd>

            <dt>Message:</dt>
            <dd>
                <pre class="prettyprint linenums"><?= $this->exception->getMessage() ?></pre>
            </dd>

            <dt>Stack trace:</dt>
            <dd>
                <pre class="prettyprint linenums"><?= $this->exception->getTraceAsString() ?></pre>
            </dd>
        </dl>
        <?php
        $e = $this->exception->getPrevious();
        if ( $e ) :
            ?>
            <hr/>
            <h2>Previous exceptions:</h2>
            <ul class="unstyled">
                <?php while ( $e ) : ?>
                    <li>
                        <h3><?= get_class( $e ) ?></h3>
                        <dl>
                            <dt>File:</dt>
                            <dd>
                                <pre class="prettyprint linenums"><?= $e->getFile() ?>:<?= $e->getLine() ?></pre>
                            </dd>

                            <dt>Message:</dt>
                            <dd>
                                <pre class="prettyprint linenums"><?= $e->getMessage() ?></pre>
                            </dd>

                            <dt>Stack trace:</dt>
                            <dd>
                                <pre class="prettyprint linenums"><?= $e->getTraceAsString() ?></pre>
                            </dd>
                        </dl>
                    </li>
                    <?php
                    $e = $e->getPrevious();
                endwhile;
                ?>
            </ul>
        <?php endif; ?>

    <?php else: ?>

        <p>No Exception available</p>

    <?php endif ?>

<?php endif ?>