ERROR_OPERATION_IN_PROGRESS - 329 (0x149)
An operation is currently in progress with the device.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_OPERATION_IN_PROGRESS with the numeric value 329 and hexadecimal representation 0x149 indicates that a requested operation cannot be performed because another operation is currently in progress on the device or resource.
Error Details
This error typically occurs when an application attempts to perform an action that conflicts with an ongoing process. For example, attempting to delete a file while it is being written to by another process would trigger this error.
Usage Context
The context in which this error might occur includes:
- File system operations such as renaming or deleting files.
- Device management actions like ejecting a drive or stopping a service.
- Network operations involving shared resources.
Developer Interpretation
Developers should interpret this error code to mean that the operation is currently in progress and cannot be completed at this time. The application should handle such errors gracefully, possibly by retrying the operation after a delay or informing the user of the current state.
Related Errors
FAQ
Q: What does this error mean?
A: The operation cannot be performed because another operation is currently in progress.
Q: How should I handle this error in my application?
A: Gracefully retry the operation or inform the user that the device or file is busy.
Summary
The ERROR_OPERATION_IN_PROGRESS error code indicates that an operation cannot be completed because another operation is currently active. Developers should ensure their applications can handle such errors by either retrying operations or providing appropriate feedback to users.