Discourse has big error when I upgrade new version

[cmdntd]

It seems normal to completed upgrades. But I can not go to forum:
How could I check error log?

• I ran ./launcher rebuild app again, but it is the same error.

Browser has this error:

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The software powering this discussion forum encountered an unexpected problem. We apologize for the inconvenience.

Detailed information about the error was logged, and an automatic notification generated. We'll take a look at it.

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[merefield (Robert)]

Some plugin may be causing that.

Check your logs.

[cmdntd]

Which log file should I check?

So many file here:

dir /var/discourse/shared/standalone/log/var-log
alternatives.log    auth.log.4.gz   dpkg.log.3.gz  kern.log       nginx        syslog.3.gz
alternatives.log.1  cron.log        dpkg.log.4.gz  mail.log       postgres     syslog.4.gz
apt                 dpkg.log        dpkg.log.5.gz  messages       postgresql   syslog.6.gz
auth.log            dpkg.log.1      dpkg.log.6.gz  messages.1     redis        syslog.7.gz
auth.log.1          dpkg.log.10.gz  dpkg.log.7.gz  messages.2.gz  syslog       unattended-upgrades
auth.log.2.gz       dpkg.log.11.gz  dpkg.log.8.gz  messages.3.gz  syslog.1     user.log
auth.log.3.gz       dpkg.log.2.gz   dpkg.log.9.gz  messages.4.gz  syslog.2.gz

[Ed_S]

@cmdntd

• I ran ./launcher rebuild app again, but it is the same error.

Run this again, and then paste the last 200 lines of output into a reply here.

[cmdntd]

It is ok now, when I disable cloudlfare to upgrade.
Could I disable/change route out of cloudflare proxy when upgrading automatically?