ERROR_REPARSE_ATTRIBUTE_CONFLICT - 4391 (0x1127)
The reparse point attribute cannot be set because it conflicts with an existing attribute.
Updated: Feb 21, 2026
Technical Background
The ERROR_REPARSE_ATTRIBUTE_CONFLICT error code is encountered when attempting to set a reparse point attribute on a file or directory that already has conflicting attributes. Reparse points are symbolic links that can be used for various purposes, such as mounting network drives, creating junctions, or implementing custom file system filters.
Error Details
When this error occurs, it indicates that the operation to set a specific reparse point attribute (such as IO_REPARSE_TAG_MOUNT_POINT, IO_REPARSE_TAG_STANDALONE_SYMLINK, etc.) cannot proceed because another attribute is already present. This can happen in scenarios where multiple reparse points are defined on the same file or directory, leading to an inherent conflict.
Common Causes
- Invalid Parameter Values: Attempting to set a reparse point attribute that conflicts with existing attributes.
- Incorrect Object Type: Applying operations intended for files to directories or vice versa, which can lead to conflicting reparse points.
- Exceeding Limits: In some cases, the system may have limitations on the number of reparse points allowed per file or directory.
Real-World Context
This error is typically encountered during file system operations where custom attributes are being set. For example, when attempting to create a mount point for a network drive that already has an existing symbolic link attribute, this error will be returned.
Is This Error Critical?
The criticality of this error depends on the specific operation and context. It is generally not a catastrophic failure but can prevent certain file system operations from completing successfully.
How to Diagnose
To diagnose this issue, review the following:
- Operation Context: Ensure that the correct type of reparse point attribute is being applied to the appropriate object (file or directory).
- Validating Parameters: Verify that no conflicting attributes are present before attempting to set a new one.
- Confirming Object Types: Check if the operation is being performed on the right type of file system object. Incorrect types can lead to conflicts.
How to Resolve
To resolve this issue, consider the following steps:
- Correct Parameter Usage: Ensure that the correct reparse point attribute is being set and that no conflicting attributes are present.
- Adjust Operation Context: If necessary, adjust the operation context or the file system object type to avoid conflicts.
- Restore Data: In cases where data corruption might be a factor, restore the original state of the file or directory if possible.
Developer Notes
Developers should ensure that reparse point attributes are set correctly and consistently. Careful validation of parameters can prevent such errors from occurring during development and deployment.
Related Errors
ERROR_REPARSE_TAG_INVALID(0x80070035): Indicates an invalid reparse tag was encountered.ERROR_NOT_A_REPARSE_POINT(0x8007003A): The specified file or directory is not a reparse point.
FAQ
Q: What does the ERROR_REPARSE_ATTRIBUTE_CONFLICT error mean?
A: It indicates that an attempt to set a specific reparse point attribute conflicts with existing attributes on the same file or directory.
Q: How can I prevent this error from occurring?
A: Ensure that no conflicting reparse point attributes are present before attempting to set new ones. Validate parameters and object types carefully.
Summary
The ERROR_REPARSE_ATTRIBUTE_CONFLICT error code is a specific technical issue encountered when setting reparse point attributes on files or directories where conflicts exist. Understanding the context and causes can help in diagnosing and resolving this error effectively.