# InvalidOperationException: Post Processing Volume has no profile assigned. Please assign a valid VolumeProfile.

- **ID:** `unity/urp-post-processing-volume-invalid`
- **Domain:** unity
- **Category:** config_error
- **Verification:** ai_generated
- **Fix Rate:** 93%

## Root Cause

A Post Processing Volume component exists on a GameObject but its Profile field is null or missing a reference to a VolumeProfile asset.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| URP 12.1.7 | active | — | — |
| URP 14.0.8 | active | — | — |
| URP 16.0.1 | active | — | — |

## Workarounds

1. **In the Inspector, drag a VolumeProfile asset (e.g., created via Assets > Create > Volume Profile) into the 'Profile' field of the Volume component.** (95% success)
   ```
   In the Inspector, drag a VolumeProfile asset (e.g., created via Assets > Create > Volume Profile) into the 'Profile' field of the Volume component.
   ```
2. **In code: `volume.profile = Resources.Load<VolumeProfile>("MyVolumeProfile");` or `volume.profile = ScriptableObject.CreateInstance<VolumeProfile>();`** (90% success)
   ```
   In code: `volume.profile = Resources.Load<VolumeProfile>("MyVolumeProfile");` or `volume.profile = ScriptableObject.CreateInstance<VolumeProfile>();`
   ```

## Dead Ends

- **** — Toggling the component doesn't assign a profile; the field remains null. (98% fail)
- **** — A new Volume also has no profile by default; you must manually assign or create one. (80% fail)
- **** — Setting to null or None is exactly the problem; you need a valid VolumeProfile reference. (95% fail)