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Common Errors

info

Some common errors you may encounter during installation.

npm install hangs on forever​

Solution from: "npm install" hangs on sill: idealTree build

On Ubuntu 22.10, disabling IPv6 fixed this:

Terminal (Root permissions)
$ sudo sysctl -w net.ipv6.conf.all.disable_ipv6=1
$ sudo sysctl -w net.ipv6.conf.default.disable_ipv6=1

To do this permanently, edit /etc/default/grub, change:

/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to:

/etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash ipv6.disable_ipv6=1"

and then run:

Terminal (Root permissions)
$ sudo update-grub

Solution from: DMOJ Documentations

Execute this command after initializing database:

Terminal (Root permissions)
$ mariadb-tzinfo-to-sql /usr/share/zoneinfo | sudo mariadb -u root mysql

Module Not Found: pkg_resources​

ModuleNotFoundError: No module named 'pkg_resources'

Context: After the make_style.sh process, you have to execute the command ./manage.py collectstatic, and it appears this error. Solution from: No module named pkg_resources

Just install setuptools module:

Terminal (Environment activated)
(vnojsite) $ pip install setuptools

Users can’t register to the main site​

Context: You are the user who is trying to register an account, and this appears: Solution from: Giaosus

Change/Add this line into your dmoj/local_settings.py or dmoj/settings.py, depending on your implementations:

dmoj/local_settings.py or dmoj/settings.py
SEND_ACTIVATION_EMAIL = False

site.conf gets on FATAL​

The error which you encountered probably is:

open("/tmp/dmoj-site.pid"): Permission denied [core/utils.c line 3602]

Easy solution, change the permissions of /tmp folder:

Terminal (Root permissions)
$ chmod 755 /tmp -R

celery and bridged STARTING then RUNNING then STARTING, again and again and again and again​

ImportError: cannot import name 'WebSocketException' from 'websocket' (unknown location)

Solution:

Terminal (Environment activated)
$ pip install websocket-client

403 Forbidden (Nginx)

Context: Most of the static files are unable to be picked up. Solution:

Nginx need to have +x access on all directories leading to the site's root directory. Ensure you have +x on all of the directories in the path leading to the site's root. For example, if the site root is /home/username/siteroot:

Terminal (Root permissions)
$ chmod +x /home/
$ chmod +x /home/username
$ chmod +x /home/username/siteroot

413 Request Entity Too Large (Nginx)

Context: As the title has said. Solution: Add this line into your nginx.conf file:

client_max_body_size 1G;

Docker not found​

Solution:

Terminal (Root permissions)
$ sudo apt install docker.io

The problem status does not update​

Solution from: https://github.com/DMOJ/online-judge/issues/816

Probably you are using the default cache backend settings. You should be using redis or memcached instead of LocMemCache. I recommend memcached, it is very easy to set up.

Install instructions from: https://medium.com/@netfluff/memcached-for-django-ecedcb74a06d (medium.com is being banned in Vietnam, consider using a VPN)

Terminal (Environment activated)
(vnojsite) $ pip install python-memcached==1.59
Terminal (Root permissions)
$ sudo apt-get install memcached

[OPTIONAL] $ memcached -vv

$ sudo service memcached start

DJANGO setup:

settings.py
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
        'LOCATION': '127.0.0.1:11211'
    }
}

Sub-problem: Cannot start memcached​

Solution from: https://stackoverflow.com/questions/60250885/cannot-start-memcached

Have a look into /etc/memcached.conf, there might be written something like:

-l xxx.xx.xx.xx
-l ::1

If you are trying to connect via localhost: just comment the line.


If you are trying to connect from somewhere else check the IP for correctness.

Sub-problem: 'Client' object has no attribute '_deletetouch' in django admin logout section​

Solution from: https://stackoverflow.com/questions/63394004/client-object-has-no-attribute-deletetouch-in-django-admin-logout-section

In case anyone got stock in this again, I've tested recent versions of python-memcached, found recently updated versions, which is 1.60 and 1.61 would cause this. So I rolled back to 1.59 and solve the problem. (this solution has been included in aforementioned instructions)