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QUICK_FIX_RESTART_BACKEND.md

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Quick Fix: Restart Backend

Error You're Seeing

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

This error when trying to add questions from the dashboard.

What's Happening

The backend is returning an HTML error page instead of JSON. This happens because:

  1. The backend needs to be restarted to load the new ai_feedback model
  2. OR the backend crashed on startup due to the new imports

Fix (3 Steps)

Step 1: Stop the Backend

If backend is running, press Ctrl+C to stop it.

Step 2: Restart the Backend

cd Backend
uvicorn main:app --reload

Step 3: Check for Errors

Look for these messages:

✅ Good (Success):

🚀 App started! Creating tables...
✅ All tables created successfully (including ai_feedback table)
INFO:     Application startup complete.

❌ Bad (Error):

Error loading model...
Traceback...

If You See Errors

Test the Model First

cd Backend
source venv/bin/activate  # or on Windows: venv\Scripts\activate
python test_ai_feedback_model.py

This will tell you exactly what's wrong.

Common Issues

Issue 1: Module not found

ModuleNotFoundError: No module named 'sqlalchemy'

Fix: Activate virtual environment

source venv/bin/activate

Issue 2: Database connection error

Could not connect to database

Fix: Check .env file has correct DATABASE_URL

Issue 3: Import circular dependency

Fix: Check the error message and let me know what it says

Quick Test

Once backend restarts successfully, test the question creation:

curl -X POST http://localhost:8000/api/questions \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Test question",
    "type": "mcq",
    "document_id": "your-document-uuid",
    "correct_answer": "A",
    "options": {"A": "Option A", "B": "Option B"}
  }'

Should return JSON, not HTML.

What to Do

  1. Stop backend (Ctrl+C)
  2. Restart backend (uvicorn main:app --reload)
  3. Check logs - Look for "✅ All tables created"
  4. Try adding question again from dashboard

If still getting error, send me the backend startup logs!