# X_FEATURE_REQUIRED

## Means

x g query or x g backfill named no slice to read

## Typical cause

A read and a sweep read an existing table, and nothing but x g resource or x g entity creates one: with no --feature and no slice of that name, the generator would have written an entity and a migration nobody asked for

## Fix

`x help g --json   # then the query generator with --feature <slice>, or the resource generator for a new table`

[CLI and verify](/error-codes#cli-and-verify)