**Service** [AdjustmentService](https://developers.google.com/ad-manager/api/reference/v202605/AdjustmentService.InventoryUnitSizesError.Reason) **InventoryService** [SuggestedAdUnitService](https://developers.google.com/ad-manager/api/reference/v202605/SuggestedAdUnitService.InventoryUnitSizesError.Reason) **Dependencies** [InventoryUnitSizesError](https://developers.google.com/ad-manager/api/reference/v202605/InventoryService.InventoryUnitSizesError) ▼ **InventoryUnitSizesError.Reason**

All possible reasons the error can be thrown.

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Namespace
:
    `https://www.google.com/apis/ads/publisher/v202605`

| Enumeration | Description |
|---|---|
| `INVALID_SIZES` | A size in the ad unit is too large or too small. |
| `INVALID_SIZE_FOR_PLATFORM` | A size is an aspect ratio, but the ad unit is not a mobile ad unit. |
| `VIDEO_FEATURE_MISSING` | A size is video, but the video feature is not enabled. |
| `VIDEO_MOBILE_LINE_ITEM_FEATURE_MISSING` | A size is video in a mobile ad unit, but the mobile video feature is not enabled. |
| `INVALID_SIZE_FOR_MASTER` | A size that has companions must have an environment of VIDEO_PLAYER. |
| `INVALID_SIZE_FOR_COMPANION` | A size that is a companion must have an environment of BROWSER. |
| `DUPLICATE_MASTER_SIZES` | Duplicate video master sizes are not allowed. |
| `ASPECT_RATIO_NOT_SUPPORTED` | A size is an aspect ratio, but aspect ratio sizes are not enabled. |
| `VIDEO_COMPANIONS_NOT_SUPPORTED` | A video size has companions, but companions are not allowed for the network |
| `UNKNOWN` | The value returned if the actual value is not exposed by the requested API version. |