# X_FLAG_TARGETING_INVALID

## Means

flag targeting is out of range or malformed

## Typical cause

`rollout: 0.5` (a fraction read as a percentage means nobody), a rollout outside 0-100, or `default: true` beside a rollout

## Fix

set `rollout` to a whole percentage 0-100 in `defineFlag({ key: '<key>' })`, and leave `default` false when a rollout decides

[Flags](/error-codes#flags)