Cron job cannot be completed

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#1
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Nextcloud version 19.0.1
Operating system and version Linux 4.19.0-10-amd64 x86_64 (containerlized)
Apache or nginx version Nginx:
PHP version 7.1:
The issue you are facing:
the cron job is not completed

Is this the first time you’ve seen this error? (Y/N): Y

The output of your Nextcloud log in Admin > Logging:

[PHP] Error: session_start(): A session had already been started - ignoring at /var/www/html/lib/private/Session/Internal.php#209

GET /index.php/apps/notes/api/v1/notes?pruneBefore=1597300436
from 120.194.97.34 at 2020-08-13T06:51:06+00:00

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'apps_paths' =>
  array (
    0 =>
    array (
      'path' => '/var/www/html/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 =>
    array (
      'path' => '/var/www/html/custom_apps',
      'url' => '/custom_apps',
      'writable' => true,
    ),
  ),
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '+',
  'trusted_domains' =>
  array (
    0 => ',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '19.0.1.1',
  'overwrite.cli.url' => '',
  'dbname' => 'nextcloud',
  'dbhost' => 'mariadb',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
);

The output of your Apache/nginx/system log in /var/log/____:

I don't think it's revelant to nginx
#2

Well, I switch to the webcron instead of system cron and it works now

image

But I still get some warning from the admin page warn that some tasks has not be executed for 3 days and urge me to switch to the system cron, I really have no idea what it means and what I can do to complete the task it mentioned.

I wonder if I can do something to improve that ? thank you.