LDC-Q4012 — The attached case file cannot be read

What it means

A question over a package can carry its own case: a file with the facts to reason about. The engine reads that file before reasoning starts. When the file is missing, unreadable, or not well-formed data, the question cannot run, and the engine reports the path together with what went wrong while reading it.

Check that the path is reachable from where the query runs and that the file holds well-formed data. The question itself stays as written.

Example

LawQL

query q over "demo.diagnostics" { for x: Applicant; where resident(x); select resident(x); case "/tmp/diag-ref-q4012-no-such-case.json"; }

Fix

LawQL

from r in rules select r

Engine message

The engine reports this in its own wording:

Output

LDC-Q4012: failed to read case /tmp/diag-ref-q4012-no-such-case.json: No such file or directory (os error 2).

Related

• Questions to the engine — the shape of a question over a package.
• LDC-Q4009 — when the path itself is not quoted.