ERROR_CALLBACK_SUPPLIED_INVALID_DATA - 1273 (0x4F9)
An application-defined callback gave invalid data when called.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_CALLBACK_SUPPLIED_INVALID_DATA error code indicates that an application-defined callback function provided invalid data during a call. This can occur in various scenarios where the system expects specific types of data or formats from a user-mode callback.
Error Details
This error is typically encountered when a Windows API function invokes a user-defined callback and finds that the data passed by the callback does not meet the expected criteria. The nature of this error suggests that there might be an issue with how the application has implemented its callback function or with the data it returns.
Usage Context
This error can occur in any scenario where a Windows API function expects a user-defined callback to provide specific types of data. Common contexts include event handling, file operations, and other asynchronous operations that involve callbacks.
Developer Interpretation
When this error is encountered, it indicates that the application's implementation of the callback function has failed to meet the expected criteria for data provided during a call. This could be due to incorrect parameter values, invalid object types, or any other issue related to the data being passed by the callback.
Related Errors
ERROR_INVALID_PARAMETER(0x57)ERROR_BAD_LENGTH(0x6D)ERROR_INVALID_DATA(0x13A)
These errors may indicate similar issues with invalid or incorrect data being passed to a function.
FAQ
Q: What does the ERROR_CALLBACK_SUPPLIED_INVALID_DATA error mean?
A: This error indicates that an application-defined callback provided invalid data when called, which can occur in various scenarios where specific types of data are expected from a user-mode callback.
Q: How can I resolve this issue?
A: Review the implementation of your callback function to ensure it provides valid and expected data. Verify parameter values, object types, and any other relevant details that might be causing the error.
Summary
The ERROR_CALLBACK_SUPPLIED_INVALID_DATA error code is a specific technical indicator that an application-defined callback has provided invalid data during a call. This can occur in various contexts where user-mode callbacks are expected to provide specific types of data. Developers should review their implementation of callback functions and ensure they meet the expected criteria for data passed to Windows API functions.