Issue with django crontabs there not working - django

Question

hello guys i trying to use django_crontab on my django project and there not working does anyone know something about this im using Linux centos 8. I want to schedule a task to add some data to my database. Can someone help me
The steps that i have take is:
pip install django-crontab
add to the installed apps
build my cron function
` from django.core.management.base import BaseCommand
from backups.models import Backups
from devices.models import Devices
from datetime import datetime
from jnpr.junos import Device
from jnpr.junos.exception import ConnectError
from lxml import etree
from django.http import HttpResponse
from django.core.files import File
class Command(BaseCommand):
def handle(self, *args, **kwargs):
devices = Devices.objects.all()
for x in devices:
devid = Devices.objects.get(pk=x.id)
ip = x.ip_address
username = x.username
password = x.password
print(devid, ip, username, password)
dev1 = Device(host= ip ,user= username, passwd= password)
try:
dev1.open()
stype = "sucsess"
dataset = dev1.rpc.get_config(options={'format':'set'})
datatext = dev1.rpc.get_config(options={'format':'text'})
result = (etree.tostring(dataset, encoding='unicode'))
file_name = f'{ip}_{datetime.now().date()}.txt'
print(file_name)
with open("media/"f'{file_name}','w') as f:
f.write(etree.tostring(dataset, encoding='unicode'))
f.write(etree.tostring(datatext, encoding='unicode'))
backup = Backups(device_id=devid, host=ip, savetype=stype, time=datetime.now(), backuptext=file_name)
print(backup)
backup.save()
except ConnectError as err:
print ("Cannot connect to device: {0}".format(err))
print("----- Faild ----------")
stype = ("Cannot connect to device: {0}".format(err))
backup = Backups(device_id=devid, host=ip, savetype=stype, time=datetime.now())
backup.save()
`
add my cronjob to my setting.py file :
CRONJOBS = [ ('*/5 * * * *', 'django.core.management.call_command', ['backup-dev']), ]
5)
python manage.py crontab add
6)
python manage.py crontab show
Currently active jobs in crontab:
0662c1224789b131740fddef54f273c1 -> ('* * * * *', 'django.core.management.call_command', ['backup-dev'])
and still not working any ideas
and when i run this command: " python manage.py backup-dev" my task working perfectly
i Also try to add the management command direct to the centos machine via crontab with the command
crontab -e
and still nothing any ideas