ERROR_MRM_DUPLICATE_MAP_NAME - 15118 (0x3B0E)

Duplicate Resource Map.

Updated: Feb 21, 2026

Technical Background

The ERROR_MRM_DUPLICATE_MAP_NAME error code is a specific error within the Windows API domain. It indicates that an operation has attempted to define a resource map with a name that already exists in the current context.

Error Details

This error typically occurs when attempting to create or modify a resource map where a duplicate name is specified. Resource maps are used for managing and organizing resources, such as device drivers or system components, within the Windows operating environment.

Common Causes

  • Invalid Parameter Values: The operation has been invoked with a parameter that specifies an existing resource map name.
  • Incorrect Object Type: The operation context may not support the creation of multiple resource maps with identical names.

Real-World Context

This error is most commonly encountered in scenarios where developers are working with device drivers or system components, particularly when managing and organizing resources through the Windows API. It can also occur during system maintenance or configuration tasks that involve resource management.

Is This Error Critical?

The criticality of this error depends on the specific operation being performed. In most cases, it is not a critical failure but rather an indication that the operation cannot proceed as intended due to the existence of a duplicate name.

How to Diagnose

To diagnose this issue, developers should:

  • Review Operation Context: Ensure that the context in which the resource map is being created or modified supports multiple maps with unique names.
  • Validate Parameters: Verify that all parameters passed to the API call are correct and do not specify a name that already exists.

How to Resolve

To resolve this issue, developers should:

  • Correct Parameter Usage: Ensure that resource map names are unique within the context of the operation. If multiple maps with similar purposes are required, consider using a naming convention or additional metadata to differentiate them.
  • Adjust Operation Context: If necessary, adjust the system configuration or operational context to support the creation of multiple resource maps with distinct names.

Developer Notes

When working with resource maps in Windows API operations, it is essential to ensure that all names are unique. This can be achieved through careful parameter validation and adherence to naming conventions. Developers should also be aware of the specific limitations and requirements of the system or subsystem they are interacting with.

Related Errors

  • ERROR_MR_MID_NOT_FOUND: Indicates that a resource map name does not exist in the current context.
  • ERROR_MR_MID_ALREADY_EXISTS: Similar to ERROR_MRM_DUPLICATE_MAP_NAME, but specifically indicates an attempt to create a resource map with a name that already exists, without specifying it as a duplicate.

FAQ

Q: What is a resource map?

A: A resource map in the context of Windows API operations refers to a structured set of resources, such as device drivers or system components, organized and managed within the operating environment.

Q: Can this error occur during normal operation?

A: This error typically occurs during specific operations where unique names are required for resource maps. It is not expected to occur in normal system usage but may be encountered during development or maintenance tasks.

Summary

The ERROR_MRM_DUPLICATE_MAP_NAME error code indicates that a duplicate name has been specified for a resource map, preventing the operation from proceeding as intended. Developers should ensure parameter validation and adherence to naming conventions to avoid this issue.