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SIFR-PACKAGE-0401 belongs to the Package management diagnostic family. It means: cargo package archive is missing required Sifr source.

Why It Happens

Sifr package or workspace metadata violates the package model. Inspect sifr.toml, Cargo metadata, source roots, trust policy, archive contents, package selectors, or projection files as named by the diagnostic.
Use sifr --explain SIFR-PACKAGE-0401 locally to see the renderer’s exact message template and any machine-applicable suggestions for the compiler version you are running.

Erroneous Code

How To Fix It

Repair the package manifest, workspace selection, projection files, archive rules, or publish options named by the diagnostic.

Fixed Code

Details

See the Error Codes index for the complete catalog.