ERROR_EVT_FILTER_ALREADYSCOPED - 15014 (0x3AA6)
An expression can only be followed by a change of scope operation if it itself evaluates to a node set and is not already part of some other change of scope operation.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_EVT_FILTER_ALREADYSCOPED (15014, 0x3AA6) indicates that an expression used in event filtering cannot be followed by a change of scope operation because it is already part of another such operation. This implies that the expression must evaluate to a node set and not be embedded within another scope-changing operation.
Error Details
This error typically arises when attempting to modify the scope of an event query or filter in a way that conflicts with existing operations. For instance, if an expression is already part of a scope change, adding another scope change would result in this error.
Usage Context
The context for this error involves event filtering and querying within the Windows Event Tracing for Windows (ETW) framework. It pertains to scenarios where users or developers are manipulating event filters or queries that involve changing the scope of events being captured or logged.
Developer Interpretation
Developers should understand that when working with ETW, expressions used in filtering must be carefully constructed to avoid conflicts with other operations. Specifically, an expression intended for a change of scope cannot itself be part of another such operation without causing this error.
Related Errors
ERROR_EVT_INVALID_QUERY(15002): An invalid query was provided.ERROR_EVT_FILTER_TOO_COMPLEX(15013): The filter is too complex to process.
FAQ
Q: What does the ERROR_EVT_FILTER_ALREADYSCOPED error mean?
A: This error indicates that an expression used in event filtering cannot be followed by a change of scope operation because it is already part of another such operation. Ensure that your expressions are correctly structured and not conflicting with other operations.
Q: How can I resolve this error?
A: Review the structure of your event filter or query to ensure that no expression is embedded within another scope-changing operation. Correct any conflicts in the structure to avoid this error.
Summary
The ERROR_EVT_FILTER_ALREADYSCOPED error (15014) signifies a conflict in the structure of an event filtering expression used in ETW. Developers should pay attention to the proper construction of their filters and queries to avoid such errors.