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Runtime error
Runtime error
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# Web Interface Troubleshooting
## HTTP 403 Error
If you see "Access to localhost was denied" or HTTP 403:
### Solution 1: Use 127.0.0.1 instead of localhost
Try accessing:
```
http://127.0.0.1:5001
```
Instead of:
```
http://localhost:5001
```
### Solution 2: Check if server is running
```bash
# Check if server is running
ps aux | grep web_app
# Or test the server
python3 test_server.py
```
### Solution 3: Clear browser cache
- Hard refresh: `Cmd+Shift+R` (Mac) or `Ctrl+Shift+R` (Windows)
- Or try incognito/private mode
### Solution 4: Check firewall settings
On macOS:
- System Settings → Network → Firewall
- Make sure Python/Flask is allowed
### Solution 5: Try a different port
The app auto-detects ports 5000-5009. If 5001 doesn't work, try:
- Check what port the server actually started on (shown in terminal)
- Or manually set a port in `web_app.py`
## Server Not Starting
### Error: "Address already in use"
```bash
# Kill any process on the port
lsof -ti:5001 | xargs kill -9
# Or use a different port
FLASK_RUN_PORT=5002 python3 web_app.py
```
### Error: "ModuleNotFoundError: No module named 'flask'"
```bash
# Install Flask
pip3 install flask
# Or use venv
source venv/bin/activate
pip install flask
```
## Quick Test
Run this to test if server is accessible:
```bash
python3 test_server.py
```
This will test both `127.0.0.1` and `localhost` URLs.
## Still Having Issues?
1. **Check server logs**: Look at the terminal where you ran `python3 web_app.py`
2. **Try curl**: `curl http://127.0.0.1:5001/health`
3. **Check browser console**: Open Developer Tools (F12) and check for errors
4. **Try different browser**: Chrome, Firefox, Safari
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