# X_AUTH_SERVER_INVALID

## Means

the authorization server was configured with a field it cannot run on

## Typical cause

authorizationServer() was handed a bad issuer, consentPath or lifetimes, or a grant was named without the lifetime, path or store method it needs

## Fix

`authorizationServer({ <field>: … })   # the field the cause names`

[Auth and sessions](/error-codes#auth-and-sessions)