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hrInvalidObject
Why this is more specific than the message text
hrInvalidObject means the resolved object type or state is incompatible with the requested operation.
This is the legacy Directory Service backup/restore HRESULT form of JET_errInvalidObject (0xC8000524).
The key comparison is: hrObjectNotFound means no object resolved; this code means the object is the wrong kind or state. The first useful observation is to capture object metadata, type, parent database/table, handle origin, and API expectations. This evidence distinguishes name collisions, stale table handles, active users, locks, and structural dependencies.
Related ESE conditions
hrIllegalOperation | the requested API is not supported for this table kind, cursor mode, or object state |
|---|---|
hrInvalidTableId | the JET_TABLEID is stale, closed, or belongs to another session/database |
hrDensityInvalid | a table or index density setting falls outside the engine-supported range |
The ESE objects in play
| Diagnostic layer | table and schema-object ownership, locks, and structural dependencies |
|---|---|
| Typical API surface | JetOpenTable, JetCreateTableColumnIndex, JetDeleteTable, and schema enumeration APIs |
| Code-specific condition | the resolved object type or state is incompatible with the requested operation |
| First corrective direction | reselect the correct object class and reject stale cached metadata |
Schema changes commonly require exclusive access and a specific transaction state. Object existence should be compared with the full expected definition before a migration is skipped.
Data for a reproducible case
- Code-specific observation: capture object metadata, type, parent database/table, handle origin, and API expectations.
- the exact schema migration step and whether a previous attempt committed; associate it with this result rather than with a later generic exception.
- the table/object metadata and normalized name.
- all JET_TABLEID owners, open modes, transactions, and current indexes.
Corrective workflow
- Freeze the failing request context and record
0xC8000524, the Jet API name, and the current instance/session ownership. - Verify the code-specific precondition: capture object metadata, type, parent database/table, handle origin, and API expectations.
- Apply the targeted fix: reselect the correct object class and reject stale cached metadata.
- Before retrying the operation, reconcile object definition, exclusive-access state, and migration version.
Actions that can hide or worsen the problem
- Do not force a schema mutation while table users remain active.
- Do not skip a migration merely because an object with the same name exists.
Technical references
- JetOpenTable.
- JetCreateTableColumnIndex
- ESE functions
- JET error codes
- Microsoft: JET_ERR enumeration
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