# X_NOTIFY_SMS_TRANSPORT_MISSING

## Means

an SMS was sent with no SmsTransport installed

## Typical cause

smsChannel() delivered outside development and test, and apps/<app>/runtime.ts names no smsTransport — the memory transport would swallow the message, so the send is refused instead

## Fix

`add smsTransport: yourTransport() to apps/<app>/runtime.ts — behavesLike(smsTransportConformance, () => yourTransport()) proves it`

[Notifications](/error-codes#notifications)