Error codes returned by IIS Admin Base Object are HRESULTS. The errors beginning with MD_ are already HRESULTS, whereas the Win32® errors, beginning with ERROR_, are converted to HRESULTS by the RETURNCODETOHRESULT macro. The conversion adds 80070000 to the Win32® error code. Other COM and RPC HRESULTS can also be returned.
The following error codes are specific to the Metadata Key.
| Error Code | Description |
|---|---|
| MD_ERROR_DATA_NOT_FOUND | The specified data was not found in the metabase. |
| MD_ERROR_INVALID_VERSION | The version specified in metadata storage was not recognized. |
| MD_WARNING_DUP_NAME | A key or data was specified more than once. The duplicate was ignored. |
| MD_WARNING_INVALID_DATA | The specified data is invalid and has been ignored. |
| MD_WARNING_PATH_NOT_FOUND | The specified key path was not found. The key and its associated metadata were ignored. |