ERROR_SXS_KEY_NOT_FOUND - 14007 (0x36B7)
The requested lookup key was not found in any active activation context.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_SXS_KEY_NOT_FOUND error code indicates that a requested lookup key was not found in any active activation context. This error is typically encountered within the Windows Side-by-Side (SXS) assembly loader and related components.
Error Details
This error suggests that during an attempt to resolve or load a specific component, such as a manifest file or a DLL, the system could not find the required key in any of the currently active activation contexts. Activation contexts are environments used by the SXS subsystem to manage and isolate assemblies and their dependencies.
Usage Context
This error can occur in various scenarios where the SXS loader attempts to resolve references within an application or a component. Common situations include loading assemblies, resolving manifest files, or handling runtime dependencies.
Developer Interpretation
When encountering this error, developers should consider that the requested key is not present in any of the current activation contexts. This could be due to several factors such as incorrect parameter values, missing keys in configuration files, or issues with the application's deployment environment.
Common Causes
- Incorrectly specified manifest file paths or keys.
- Missing or corrupted manifest files.
- Inconsistent deployment across multiple environments.
- Incorrect activation context settings.
Related Errors
ERROR_SXS_CORRUPT_MANIFEST(14002, 0x36A2)ERROR_SXS_KEY_NOT_FOUND(14007, 0x36B7)ERROR_SXS_ACTIVATION_CONTEXT_DISABLED(14008, 0x36B8)
FAQ
Q: What does the ERROR_SXS_KEY_NOT_FOUND error mean?
A: It indicates that a required lookup key was not found in any active activation context.
Q: How can I resolve this issue?
A: Ensure that all manifest files and keys are correctly specified and present. Verify the deployment environment for consistency, and check activation context settings.
Summary
The ERROR_SXS_KEY_NOT_FOUND error code is a specific technical indicator used by the Windows SXS subsystem to signal that a required lookup key was not found in any active activation context. Developers should focus on verifying manifest files, keys, and deployment environments when encountering this issue.