Error 520: Web Server is returning an unknown error CyberPanel

Hello l am getting this error
2020-06-01 07:26:03.927440 [NOTICE] [AutoRestarter] cleanup children processes and unix sockets belong to process 414528 !
2020-06-01 07:26:04.000066 [NOTICE] [AutoRestarter] child process with pid=414529 received signal=11, a core file is created

currently using cyberpanel, all website are giving a 520, the panel is working if anyone can help me out l would really really appreciated thanks in advance