Symptom: the keyset loads, but a specific entry is rejected.
Because the rest of the file parsed successfully, the problem is local to one entry rather than to the file as a whole. That is useful: it rules out encoding and line endings, and points at formatting, naming or structure for a single line.
Likely causes
- Formatting. A stray space, a missing separator or a tab where a space is expected.
- Case. A name or value altered in case, which makes it a different token.
- Length. An entry truncated or extended by an editing error.
- Naming. An entry name that does not match what the parser expects, often after a manual edit or a partial copy-paste.
How to confirm
Run a local format validator and compare which entry it flags against the parser’s own message. If the same entry is flagged in both, it is a structural problem with that line.
Why not to fix it by hand
There is no integrity check in a keyset, so a hand-edited entry is indistinguishable from a corrupted one. Regenerating from the source is safer than repairing the line — see handling & storage.
Where this connects
Entry structure is described in the prod.keys file guide. If the flagged entry belongs to a category that the content expects at a different revision, the real issue may be a revision mismatch — see unsupported revision.