What does Windows error code 15151 (ERROR_PRI_MERGE_ADD_FILE_FAILED) mean?

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ERROR_PRI_MERGE_ADD_FILE_FAILED

Unable to add one of the PRI files to the merged file.

A wrapper may expose ERROR_PRI_MERGE_ADD_FILE_FAILED through PowerShell, RPC, REST, JSON, or an installer log, but the actionable evidence remains in the original Windows component. Keep decimal 15151, hexadecimal 0x00003B2F, and the producing function together.

Operational meaning

The key question is whether the input identities, schemas, qualifiers, and package roles are compatible with the merge set. The value describes adding a successfully loaded PRI input into the merged resource graph; it does not prove that the whole domain, DNS service, network, servicing stack, application package, or operating system has failed.

Likely impact: Removing an arbitrary file may make merge succeed while silently omitting required resources. Record the scope that was actually tested instead of escalating from one rejected object or phase to a system-wide outage.

Where the result appears

• This result can appear while processing adding a successfully loaded PRI input into the merged resource graph.
• This result can appear while merging resources.pri files for an app package, resource package, or deployment image.
• This result can appear while MakePri merge or build automation that combines package resource indexes.
• It can appear while validation of package family, main-package, bundle, schema, and canonical output constraints.

Typical causes

• the file conflicts with an existing resource map.
• package identity is incompatible.
• qualifier or schema data cannot be combined.
• the input duplicates an unsupported role.

Diagnostic sequence

1. capture it immediately after the failing or status-returning call and record whether the API uses Win32, DNS_STATUS, HRESULT conversion, or callback semantics.
2. identify the exact target involved in adding a successfully loaded PRI input into the merged resource graph, including stable GUIDs, DNs, zone names, package identities, file hashes, policy names, or process identifiers as applicable.
3. prove the state boundary: the input identities, schemas, qualifiers, and package roles are compatible with the merge set.
4. collect input file and package identity and merge order before restarting services, deleting objects, rebuilding packages, or changing policy.
5. correlate resource map and schema diagnostics with MakePri command line, input PRI inventory, package identities, schemas, file hashes, output path, tool version, and the first detailed merge diagnostic.
6. determine whether the result is a failure, warning, informational completion, continuation request, or marker constant before choosing retry behavior.
7. after changing one responsible condition, repeat the same smallest operation and verify both success and absence of unintended partial effects.

Evidence to preserve

• collect input file and package identity.
• collect merge order.
• collect resource map and schema diagnostics.
• collect qualifier inventory.
• collect MakePri detailed error.

Correlate this evidence with MakePri command line, input PRI inventory, package identities, schemas, file hashes, output path, tool version, and the first detailed merge diagnostic. Preserve raw identifiers and the first detailed diagnostic: translating everything to 15151 can hide whether the cause was validation, topology, authorization, replication, policy, file I/O, packaging, or an intentional continuation state.

Recovery and retry

The recovery objective for it is to identify the conflicting input and correct its package or resource metadata, then rebuild the merge set from scratch.

Retry only after the recorded boundary changes and prior completion is known. Read-only discovery for it can usually be repeated with bounded backoff; directory mutations, DNS updates, policy installation, servicing actions, and PRI writes require a state check first. Backoff for it cannot repair malformed input, unsupported structure, identity collision, missing authority, or incompatible package metadata.

Telemetry and support fields

• record pri_merge_add_file_failed_operation — producing API, command, callback, or servicing phase.
• record pri_merge_add_file_failed_target — stable object, zone, policy, package, file, or account identity.
• record pri_merge_add_file_failed_state_before and pri_merge_add_file_failed_requested_state.
• record pri_merge_add_file_failed_first_status — earliest component-specific code before translation.
• record pri_merge_add_file_failed_server, pri_merge_add_file_failed_process, UTC timestamp, and correlation ID.

A support bundle for it should include decimal 15151, hexadecimal 0x00003B2F, the smallest reproducible request, target identity, effective configuration, and evidence from the owning Windows component. When documenting it, remove secrets from exported logs but keep SIDs, GUIDs, package-family names, record types, and hashes when they are needed to distinguish objects.

Difference from nearby results

ERROR_PRI_MERGE_LOAD_FILE_FAILED cannot read the input; this code reads it but rejects incorporation This distinction determines whether the correct next step is input correction, topology repair, continuation, policy review, package rebuild, or no error handling at all.

Practical validation scenario

A PRI validates alone but defines a conflicting resource map when added after another package. Rebuilding it with the intended package identity resolves the conflict. A negative test should reproduce it with the responsible condition preserved; the recovery test should alter only that condition and confirm the intended final state.

Developer and administrator guidance

Developers should model it explicitly in the result domain instead of collapsing every nonzero value into “failed.” Administrators should capture evidence before destructive remediation and use the component that owns adding a successfully loaded PRI input into the merged resource graph. Monitoring for it should suppress range markers and classify warning, informational, cancellation, and continuation values separately from terminal failures.

References

• Microsoft: exact Win32 system error range — official context relevant to it.
• Microsoft: MakePri.exe command options — official context relevant to it.
• Microsoft: Package Resource Index files — official context relevant to it.

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