When I visit [Ovservium-host]/probes/view=graphs/

I get this:

No probes found.

Oops! Something went wrong.

Call to undefined function generate_probe_help_css() in /opt/observium/html/includes/modals/add_probe.inc.php:169

#0: (unknown function) called at [/opt/observium/html/includes/modals/add_probe.inc.php:169]

164: $cmd_preview = get_probe_cmd_preview($probe_type, $device_id);
165: $probe_args_data[$probe_type] = $cmd_preview;
{{166: }}}
167:
168: // Add CSS for improved styling
169: echo generate_probe_help_css();
170:
171: // Add JavaScript for probe help functionality
172: echo '<script type="text/javascript">
173: var probeHelpData = ' . json_encode($probe_help_data) . ';
174: var probeArgsData = ' . json_encode($probe_args_data) . ';

#1: include called at [/opt/observium/html/pages/probes.inc.php:80]

75: unset($navbar);
76:
77: print_probe_table($vars);
78:
79: if ($_SESSION['userlevel'] >= 9) {
80: include($config['html_dir'] . '/includes/modals/add_probe.inc.php');
{{81: }}}
82:
83: // EOF

#2: include called at [/opt/observium/html/index.php:258]

253: </div>
254: </div>
255: <div class="col-xl-8 col-lg-12">';
{{256: }}}
257:
258: include($page_file);
259: echo '</div>';
{{260: }}}
261:
262: // Register default panel if custom not set
263: if (!isset($GLOBALS['cache_html']['page_panel'])) {