# AssertionError: The `python-multipart` library must be installed to use form parsing.

- **ID:** `python/starlette-form-data-missing-python-multipart`
- **Domain:** python
- **Category:** install_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

FastAPI/Starlette form handling requires python-multipart, which is not installed.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 3.x | active | — | — |

## Workarounds

1. **** (98% success)
   ```
   pip install python-multipart
   ```
2. **** (95% success)
   ```
   echo 'python-multipart>=0.0.9' >> requirements.txt
   ```

## Dead Ends

- **** — Form submissions are not JSON; parsing fails with a different error. (85% fail)
- **** — The assertion fires before the handler runs. (90% fail)