Error update cyber panel

Support and Discussion Updates
1 
Traceback (most recent call last):
  File "upgrade.py", line 2684, in <module>
    main()
  File "upgrade.py", line 2680, in main
    Upgrade.upgrade(args.branch)
  File "upgrade.py", line 2595, in upgrade
    Upgrade.UpdateConfigOfCustomACL()
  File "upgrade.py", line 2493, in UpdateConfigOfCustomACL
    django.setup()
  File "/usr/local/CyberPanel/lib/python3.6/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/CyberPanel/lib/python3.6/site-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/usr/local/CyberPanel/lib/python3.6/site-packages/django/apps/config.py", line 211, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/local/CyberPanel/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/local/CyberCP/websiteFunctions/models.py", line 41, in <module>
    class backupSchedules(models.Model):
  File "/usr/local/CyberCP/websiteFunctions/models.py", line 42, in backupSchedules
    dest = models.ForeignKey(dest)
TypeError: __init__() missing 1 required positional argument: 'on_delete'
2

Which operating system? and which hosting provider?

3

Hello, cyberpanel is installed in docker centos OS, everything is deployed on a virtual machine

4

Cyberpanel is not recommended to install in docker

5

Why is it not recommended to install in docker?