Blank PMA page after converting PHP to version 8.0

It is necessary to reconfigure PHP to version 8.0 on my server. I did it do and the server works fine but after logging in to PMA I have a blank page, they can't even log out. Re-updating ISPConfig did not help. Please help.

Code:

##### SERVER #####
IP-address (as per hostname): ***.***.***.***
[WARN] could not determine server's ip address by ifconfig
[INFO] OS version is Ubuntu 20.04.3 LTS

[INFO] uptime:  23:49:35 up 27 days,  1:36,  2 users,  load average: 0.90, 3.93, 5.85

[INFO] memory:
              total        used        free      shared  buff/cache   available
Mem:           62Gi        15Gi       2.7Gi        70Mi        44Gi        46Gi
Swap:         1.0Gi       141Mi       882Mi

[INFO] systemd failed services status:
  UNIT                       LOAD   ACTIVE SUB    DESCRIPTION
● snap.certbot.renew.service loaded failed failed Service for snap application certbot.renew

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

1 loaded units listed.

[INFO] ISPConfig is installed.

##### ISPCONFIG #####
ISPConfig version is 3.2.7p1


##### VERSION CHECK #####

[INFO] php (cli) version is 8.0.13
[INFO] php-cgi (used for cgi php in default vhost!) is version 8.0.13

##### PORT CHECK #####


##### MAIL SERVER CHECK #####


##### RUNNING SERVER PROCESSES #####

[INFO] I found the following web server(s):
        Apache 2 (PID 2618426)
[INFO] I found the following mail server(s):
        Postfix (PID 2617972)
[INFO] I found the following pop3 server(s):
        Dovecot (PID 2618386)
[INFO] I found the following imap server(s):
        Dovecot (PID 2618386)
[INFO] I found the following ftp server(s):
        PureFTP (PID 2618453)
...

 

Just updating PHP does not work. ISPConfig only supports the PHP version that is default on the OS it runs on, so on Ubuntu 20.04 it is not 8.0.
What you can do is add additional PHP versions, which can be assigned per website. You can have one website running PHP 5.6, another running PHP 8.0.
See "Using Multiple PHP versions" from https://www.ispconfig.org/documentation/ .

 

Thanks, I assumed it after looking at apache2 error.log