ERROR_FUNCTION_NOT_CALLED - 1626 (0x65A)
Function could not be executed.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_FUNCTION_NOT_CALLED with the numeric value 1626 and hexadecimal representation 0x65A indicates that a function was expected to be called but was not. This return code is typically used by functions or APIs when they detect an invalid state where a required operation has not been performed.
Error Details
This error is returned as a generic indication of a failure in the execution flow, often due to missing prerequisites for a specific function call. It does not provide detailed information about the exact nature of the issue but serves as a broad signal that an expected action was not taken.
Usage Context
The ERROR_FUNCTION_NOT_CALLED error can be encountered in various scenarios where a function or API expects certain conditions to be met before proceeding with its operations. This could include situations such as attempting to use a resource without first initializing it, or calling a function that requires another function to have been called previously.
Developer Interpretation
When encountering this error, developers should review the context in which the function was called and ensure all necessary prerequisites are met before invoking the function. The error suggests that there is an unfulfilled requirement for the operation to proceed correctly.
Related Errors
ERROR_INVALID_FUNCTION(1)ERROR_NOT_SUFFICIENT_BUFFER(702)ERROR_NO_DATA(183)
FAQ
Q: What does the ERROR_FUNCTION_NOT_CALLED error mean?
A: It indicates that a required function was not called before an operation was attempted.
Q: How can I resolve this issue?
A: Ensure all necessary functions are called in the correct sequence and that their prerequisites are met before invoking them.
Summary
The ERROR_FUNCTION_NOT_CALLED error is a generic indication of a failure where a required function was not executed. Developers should carefully review the context and ensure all necessary steps are completed before attempting to use an API or function.