ispconfig job queue not processing

Hello, first of let me say that I am very new to all this linux stuff, so I followed The Perfect Server guide for Ubuntu 20.04, and everything worked fine for about a day, I added a website, set my dns and everything was working great, today I was following a guide to get SSL on ispconfig page and after creating a site I noticed it was taking a long time in queue, I did a few more tasks and I noticed the queue wasn't moving and it was in fact stuck.

I followed the "Debugging of ISPConfig 3 server actions in case of a failure" and this is what with /usr/local/ispconfig/server/server.sh


16.09.2020-06:25 - WARNING - There is already a lockfile set, but no process running with this pid (84044). Continuing.
16.09.2020-06:25 - DEBUG - Calling function 'check_phpini_changes' from plugin 'webserver_plugin' raised by action 'server_plugins_loaded'.
16.09.2020-06:25 - DEBUG - Found 48 changes, starting update process.
16.09.2020-06:25 - DEBUG - Calling function 'ssl' from plugin 'apache2_plugin' raised by event 'web_domain_update'.
16.09.2020-06:25 - DEBUG - Calling function 'update' from plugin 'apache2_plugin' raised by event 'web_domain_update'.
16.09.2020-06:25 - DEBUG - safe_exec cmd: chattr -i '/var/www/clients/client1/web2' - return code: 0
16.09.2020-06:25 - DEBUG - safe_exec cmd: chattr +i '/var/www/clients/client1/web2' - return code: 0
16.09.2020-06:25 - DEBUG - safe_exec cmd: df -T '/var/www/clients/client1/web2'|awk 'END{print $2,$NF}' - return code: 0
16.09.2020-06:25 - DEBUG - safe_exec cmd: which 'setquota' 2> /dev/null - return code: 0
16.09.2020-06:25 - DEBUG - safe_exec cmd: setquota -u 'web2' '0' '0' 0 0 -a &> /dev/null - return code: 0
16.09.2020-06:25 - DEBUG - safe_exec cmd: setquota -T -u 'web2' 604800 604800 -a &> /dev/null - return code: 0
16.09.2020-06:25 - DEBUG - safe_exec cmd: chattr +i '/var/www/clients/client1/web2' - return code: 0
16.09.2020-06:25 - DEBUG - Verified domain ns332869.ip-37-187-125.eu should be reachable for letsencrypt.
PHP Fatal error: Uncaught Error: Call to undefined function get_domain() in /usr/local/ispconfig/server/lib/classes/letsencrypt.inc.php:385
Stack trace:
#0 /usr/local/ispconfig/server/plugins-available/apache2_plugin.inc.php(1275): letsencrypt->request_certificates()
#1 /usr/local/ispconfig/server/lib/classes/plugins.inc.php(120): apache2_plugin->update()
#2 /usr/local/ispconfig/server/mods-available/web_module.inc.php(139): plugins->raiseEvent()
#3 /usr/local/ispconfig/server/lib/classes/modules.inc.php(302): web_module->process()
#4 /usr/local/ispconfig/server/lib/classes/modules.inc.php(235): modules->raiseTableHook()
#5 /usr/local/ispconfig/server/server.php(180): modules->processDatalog()
#6 {main}
thrown in /usr/local/ispconfig/server/lib/classes/letsencrypt.inc.php on line 385

I tried fixing the PHP Fatal error but without success, any help would be greatly appreciated. Thank you.

 

Fixed! You are a godsend, thank you!