X_EXERCISE_FILE_UNEDITABLE

Means

x g could not add an entry to apps/web/exercise.ts

Typical cause

the app keeps apps/web/exercise.ts in a shape the generator cannot edit safely: no single export const exercise = defineExercise({ … }) with an object literal

Fix

edit apps/web/exercise.ts — paste the entry the finding names into export const exercise = defineExercise({ … })

Listed under CLI and verify

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