Error Class 'cronmanager' not found

[4-FLOSS-Free-Libre-Open-Source-Software]

url: admin/config.php?display=concurrentcalls
or
admin/config.php?display=extbreakdown
Error
/var/www/html/admin/modules/callstatistics/page.concurrentcalls.php:6
/var/www/html/admin/modules/callstatistics/page.extbreakdown.php:6

FreePBX Framework15.0.16.64

[mavhc]

Simplest fix is to remove the check:

// check to see if user has automatic updates enabled in FreePBX settings
if($quietmode && $_REQUEST['ccgraph']) {
        include_once(dirname(__FILE__).'/concurrentcalls/cc_graph.php');
} else {
        //$cm =& cronmanager::create($db);
        //$online_updates = $cm->updates_enabled() ? true : false;
        // check dev site to see if new version of module is available
        //if ($online_updates && $foo = callstatistics_vercheck()) {
        //      echo "<br>A <b>new version of this module is available</b> from the <a target='_blank' href='http://pbxossa.org'>PBX Open Source Software Alliance</a><br>";
        //}
        include_once(dirname(__FILE__).'/concurrentcalls/concurrentcalls.php');
        $module_local = callstatistics_xml2array("modules/callstatistics/module.xml");
        echo $module_local[module][name]." ver: ".$module_local[module][version];
}
?>