What does Windows error code 15154 (ERROR_PRI_MERGE_MULTIPLE_MAIN_PACKAGES_NOT_ALLOWED) mean?

ERROR_PRI_MERGE_MULTIPLE_MAIN_PACKAGES_NOT_ALLOWED

Packages for a PRI file merge must not include multiple main packages.

ERROR_PRI_MERGE_MULTIPLE_MAIN_PACKAGES_NOT_ALLOWED is a domain-specific Windows result.

Likely impact: Choosing a main package by file order makes output nondeterministic and can bind resources to the wrong identity.

Typical causes

• two main-package outputs are included.
• a bundle was expanded incorrectly.
• artifact classification marks a resource package as main.
• incremental build leaves an obsolete main PRI.

Troubleshooting steps

1. Verify that the merge has exactly one main package that supplies authoritative identity and schema.
2. Collect package role of every input and main package identities.
3. Correlate artifact manifest with MakePri command line, input PRI inventory, package identities, schemas, file hashes, output path, tool version, and the first detailed merge diagnostic.

Useful evidence

• Collect build directory age and hashes.
• Collect MakePri classification diagnostic.

Recovery and retry

Select one authoritative main package and include only its compatible resource packages.

Related errors

ERROR_PRI_MERGE_MULTIPLE_PACKAGE_FAMILIES_NOT_ALLOWED finds distinct families; this code can occur within one family with multiple main packages

Example

A staging directory contains main PRI files from debug and release builds of the same app. Cleaning the directory leaves one authoritative main package.

References

• Microsoft: exact Win32 system error range
• Microsoft: MakePri.exe command options
• Microsoft: Package Resource Index files