What does Windows error code 15150 (ERROR_PRI_MERGE_LOAD_FILE_FAILED) mean?

ERROR_PRI_MERGE_LOAD_FILE_FAILED

Unable to load one of the PRI files to be merged.

Treat ERROR_PRI_MERGE_LOAD_FILE_FAILED as a domain-specific result, not as a generic exception. Diagnosis begins with the exact operation, target identity, server or process that produced it, and the earliest lower-level diagnostic available at the same timestamp.

Operational meaning

The key question is whether every listed PRI exists, is readable, and has a valid index structure. The value describes loading one input PRI before the merge can begin; it does not prove that the whole domain, DNS service, network, servicing stack, application package, or operating system has failed.

Likely impact: No output should be trusted if required input files cannot be opened and validated. 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 loading one input PRI before the merge can begin.
• 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 path is wrong or inaccessible.
• the PRI is corrupt or incomplete.
• a file is locked or replaced during the build.
• the input is not actually a PRI file.

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 loading one input PRI before the merge can begin, including stable GUIDs, DNs, zone names, package identities, file hashes, policy names, or process identifiers as applicable.
3. prove the state boundary: every listed PRI exists, is readable, and has a valid index structure.
4. collect failing input path and file hash, size, and ACL before restarting services, deleting objects, rebuilding packages, or changing policy.
5. correlate MakePri diagnostic 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 failing input path.
• collect file hash, size, and ACL.
• collect MakePri diagnostic.
• collect PRI dump or validation result.
• collect build artifact provenance.

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 15150 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 restore or regenerate the exact failing input and freeze the input set before retrying merge.

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_load_file_failed_operation — producing API, command, callback, or servicing phase.
• record pri_merge_load_file_failed_target — stable object, zone, policy, package, file, or account identity.
• record pri_merge_load_file_failed_state_before and pri_merge_load_file_failed_requested_state.
• record pri_merge_load_file_failed_first_status — earliest component-specific code before translation.
• record pri_merge_load_file_failed_server, pri_merge_load_file_failed_process, UTC timestamp, and correlation ID.

A support bundle for it should include decimal 15150, hexadecimal 0x00003B2E, 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_ADD_FILE_FAILED occurs after a file is loaded and then cannot be incorporated; this code fails while loading it 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 stale manifest points to a deleted resource PRI. Regenerating the artifact list and validating every path prevents the load failure. 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 loading one input PRI before the merge can begin. 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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