I cannot save any config changes. I get the following error:
exit: 1
Unable to continue. Failed to acquire the “crontab-asterisk” lock. in /var/www/html/admin/libraries/Composer/vendor/symfony/lock/Lock.php on line 101
#0 /var/www/html/admin/libraries/BMO/Cron.class.php(115): Symfony\Component\Lock\Lock->acquire(true)
#1 /var/www/html/admin/libraries/BMO/Cron.class.php(228): FreePBX\Cron->addLine(’*/1 * * * * /va…’)
#2 /var/www/html/admin/modules/pagingpro/Pagingpro.class.php(557): FreePBX\Cron->add(Array)
#3 /var/www/html/admin/modules/pagingpro/Pagingpro.class.php(542): Pagingpro->addMasterCron()
#4 /var/www/html/admin/libraries/BMO/DialplanHooks.class.php(107): Pagingpro->doDialplanHook(Object(extensions), ‘asterisk’, 900)
#5 /var/lib/asterisk/bin/retrieve_conf(860): FreePBX\DialplanHooks->processHooks(‘asterisk’, Array)
#6 {main}
a little guidance would be greatly appreciated.