Application failed to respond

Question

my django web app deployed without any errors trying to view it and im getting this error 
and worked fine on local host im a beginner and new to railway 
any help please

here is my 
{
  "$schema": "https://railway.app/railway.schema.json",
  "build": {
    "builder": "NIXPACKS",
    "nixpacksPlan": {
      "providers": ["python"],
      "phases": {
        "setup": {
          "nixPkgs": ["python39", "nodejs"],
          "buildCommand": [
            "pip install -r requirements.txt",
            "npm install",
            "python manage.py migrate",
            "python manage.py collectstatic --noinput"
          ]
        }
      }
    }
  },
  "deploy": {
    "runtime": "UNSPECIFIED",
    "numReplicas": 1,
    "startCommand": "gunicorn hartlord.wsgi:application --bind 0.0.0.0:8000 --log-level debug",
    "sleepApplication": false,
    "restartPolicyType": "ON_FAILURE",
    "restartPolicyMaxRetries": 10
  },
  "envs": {
    "DJANGO_SECRET_KEY": "@django_secret_key",
    "DJANGO_DEBUG": "False"
  }
}