After upgrade, getting the following error message:

Oops! Something went wrong.

Class "Doctrine\SqlFormatter\SqlFormatter" not found in /opt/observium/html/includes/print/navbar.inc.php:486

#0: (unknown function) called at [/opt/observium/html/includes/print/navbar.inc.php:486]

481: $sql_query['location'] = str_replace($config['install_dir'] . '/', '', $sql_query['location']);
482:
483:
484: echo '<span class="label label-primary">' . $sql_query['function'] . '()</span> <span class="label label-info">' .
485: $sql_query['location'] . ':' . $sql_query['line'] . '</span> <span class="label">' . round($sql_query['time'], 3) . 's</span>
486: ' . (new Doctrine\SqlFormatter\SqlFormatter())->format($sql_query['sql']);
{{487: }}}
488:
489: ?>
490: </div>
491: </li>

#1: print_navbar_stats_debug called at [/opt/observium/html/includes/navbar_footer.inc.php:110]

105: ?>
106: </li>
107:
108: <?php
109:
110: print_navbar_stats_debug();
111:
112: print_navbar_stats();
113:
114: ?>
115:

#2: include called at [/opt/observium/html/index.php:300]

295: </div>
296:
297: <?php
298:
299: if (!get_var_true($vars['bare'])) {
300: include($config['html_dir'] . "/includes/navbar_footer.inc.php");
301: } // end if bare
302:
303: clear_duplicate_cookies();
304:
305: // <script type="text/javascript">