ERROR_SXS_ASSEMBLY_MISSING - 14081 (0x3701)
The referenced assembly could not be found.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_SXS_ASSEMBLY_MISSING error code indicates that a required assembly could not be located during the execution of an application or service. This error is part of the Side-by-Side Assembly (SXS) subsystem, which manages multiple versions of assemblies and ensures compatibility across different applications.
Error Details
This error typically occurs when an application attempts to load a specific version of an assembly that is not present in the expected location. The SXS subsystem relies on manifest files to locate and load assemblies, and if it cannot find the required assembly, this error is generated.
Usage Context
The ERROR_SXS_ASSEMBLY_MISSING can be encountered in various scenarios where assemblies are dynamically loaded or referenced by an application. Common contexts include:
- Application startup
- Dynamic loading of plugins or extensions
- Execution of code that relies on specific versions of assemblies
Developer Interpretation
Developers should interpret this error as a failure to locate the required assembly, which can be due to several reasons such as incorrect paths in manifest files, missing files, or issues with the SXS cache. The error does not provide detailed information about the specific file that is missing; therefore, developers need to investigate further to resolve the issue.
Related Errors
ERROR_SXS_FILE_HASH_MISMATCH(14082): Indicates a mismatch in the hash of an assembly.ERROR_SXS_MANIFEST_IDENTITY_NOT_SCOPED(14079): Suggests that the manifest identity is not properly scoped.
FAQ
Q: What does the ERROR_SXS_ASSEMBLY_MISSING error mean?
A: It indicates that a required assembly could not be found during the execution of an application or service.
Q: How can I resolve this issue?
A: Review the manifest files and ensure that all paths to assemblies are correct. Verify that the assemblies exist in the expected locations and that they match the versions specified in the manifests.
Summary
The ERROR_SXS_ASSEMBLY_MISSING error code is a specific technical indicator of an assembly loading failure within the SXS subsystem. Developers should focus on verifying manifest files, ensuring correct paths, and confirming the presence of required assemblies to resolve this issue.