What does Windows error code 124 (ERROR_INVALID_LEVEL) mean?

ERROR_INVALID_LEVEL

What ERROR_INVALID_LEVEL means

ERROR_INVALID_LEVEL is a Win32 system result whose documented message is: “The system call level is not correct.” In practical troubleshooting, it belongs to Win32 and legacy APIs that accept an information level selecting the structure or detail set to return.

Typical causes

• the requested information level is not implemented on this OS version
• the caller passed a level intended for a different API
• a wrapper converted an enum incorrectly or supplied an uninitialized value

How to investigate the result

1. Log the numeric level and exact API name
2. Test the minimum documented level supported by all target systems
3. Verify the output structure matches the selected level

Developer guidance

Use named constants, validate levels before dispatch, and implement graceful fallback to a lower information level when permitted by the contract.

Administrator and support guidance

Check whether the application recently moved to an older Windows build or compatibility host. Configuration changes rarely fix an executable requesting an unsupported information level.

Example

An inventory agent requests a newer server-information level on an older host. The host recognizes the API but rejects that level with this result.

How it differs from related results

ERROR_INVALID_PARAMETER is broad; it identifies the selector that chooses an API information format.

References

• Microsoft: System error codes 0–499