# X_NOT_IMPLEMENTED

## Means

this driver does not implement the requested feature

## Typical cause

an interface-complete driver whose remote half is unwritten

## Fix

use the default driver, or implement the named method

[Core and runtime](/error-codes#core-and-runtime)

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## Means

a planned command, or a driver whose remote half is unwritten

## Typical cause

one of the commands in [CLI reference](/cli-reference)'s planned table

## Fix

the `fix` names the closest shipped command — never "not a command", which would send you looking for a typo

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