| Error Code | Description |
| E_DUPLICATE_TERMINAL | Specified device already exists |
| E_INVALID_HIERARCHY | Hierarchy does not exist. |
| E_DUPLICATE_HIERARCHY | Multiple nodes found in hierarchy for value of “HierarchyName”. |
| E_INVALID_APPLICATION | Application does not exist |
| E_INVALID_MODEL | Model does not exist |
| E_INVALID_PACKAGE | Package does not exist |
| E_INCOMPATIBLE_PACKAGE | Package is not compatible with existing packages assigned to device, due to presence of common application. |
| E_INVALID_PARAMETER | Parameter does not exist |
| E_INVALID_REFERENCE_SET | Reference set does not exist |
| E_INVALID_GROUP | Group does not exist |
| E_LICENSE_EXCEEDED | Unable to add device, as the number of devices currently in the VHQ database has exceeded the licensed number of devices. |
| E_GENERAL_ERROR | General Error |