Exception File '/var/www/html/admin/modules/zulu/includes/zulu.extend.class.php' doesn't exist

Exception thrown with message "File '/var/www/html/admin/modules/zulu/includes/zulu.extend.class.php' doesn't exist"

Stacktrace:
#9 Exception in /var/www/html/admin/modules/sysadmin/functions.inc/Schmooze.class.php:36
#8 Schmooze\Zend:isZended in /var/www/html/admin/modules/sysadmin/functions.inc/Schmooze.class.php:55
#7 Schmooze\Zend:fileIsLicenced in /var/www/html/admin/modules/sysadmin/functions.inc/Schmooze.class.php:18
#6 Schmooze\Zend:includeIf in /var/www/html/admin/modules/zulu/Zulu.class.php:48
#5 FreePBX\modules\Zulu:__construct in /var/www/html/admin/libraries/BMO/Self_Helper.class.php:124
#4 FreePBX\Self_Helper:autoLoad in /var/www/html/admin/libraries/BMO/Self_Helper.class.php:63
#3 FreePBX\Self_Helper:injectClass in /var/www/html/admin/libraries/modulefunctions.class.php:2560
#2 module_functions:_runscripts in /var/www/html/admin/libraries/modulefunctions.class.php:2034
#1 module_functions:install in /var/www/html/admin/page.modules.php:273
#0 include in /var/www/html/admin/config.php:477