ERROR_SWAPERROR - 999 (0x3E7)
Error performing inpage operation. Requirements Expand table Requirement Value Minimum supported client Windows XP [desktop apps only] Minimum supported server Windows Server 2003 [desktop apps only] Header WinError.h See also System Error Codes Last updated on 07/14/2025
Updated: Feb 21, 2026
Overview
The ERROR_SWAPERROR error code, with a numeric value of 999 (0x3E7), indicates an issue encountered during inpage operations. This error is specific to certain Windows API behaviors and is documented for reference purposes.
Technical Meaning
This error code signifies that the system was unable to perform an operation on a page within a file or memory structure, which could be due to various underlying issues such as invalid parameters, corrupted data, or unsupported operations. The exact nature of the inpage operation can vary depending on the context in which this error is encountered.
Error Details
The ERROR_SWAPERROR code is primarily associated with scenarios where an attempt was made to perform a specific type of inpage operation that failed due to one of several possible reasons, including but not limited to:
- Invalid parameters passed to the API function.
- Corruption or invalid state within the file or memory structure being operated on.
- The operation is unsupported by the current system configuration or environment.
Usage Context
This error code can be encountered in various scenarios where inpage operations are performed, such as during file I/O operations, memory management functions, or other low-level API interactions. It is important to note that this error does not provide specific details about what operation failed; it only indicates that an issue occurred.
Developer Interpretation
When encountering the ERROR_SWAPERROR code, developers should interpret it as a generic indication of failure in performing an inpage operation. The exact cause must be determined by examining the context and parameters involved in the operation. Common causes include invalid input data, corrupted state within the file or memory structure, or unsupported operations.
Related Errors
ERROR_INVALID_PARAMETER(0x57)ERROR_FILE_CORRUPT(0x80070641)ERROR_NOT_SUPPORTED(0x80070032)
FAQ
Q: What does the ERROR_SWAPERROR code indicate?
A: It indicates an issue with performing inpage operations, which could be due to invalid parameters, corrupted data, or unsupported operations.
Q: How can I troubleshoot this error?
A: Review the context and parameters of the operation that failed. Check for valid input data, ensure the file or memory structure is not corrupted, and verify that the operation is supported by your current system configuration.
Summary
The ERROR_SWAPERROR code (999, 0x3E7) is a generic indication of failure in performing an inpage operation. It does not provide specific details about what went wrong but suggests that there was an issue with the parameters or state involved in the operation. Developers should interpret this error as a broad warning and investigate further to determine the exact cause.