# X_BEARER_MOUNT_INVALID

## Means

a bearer mount declaration cannot be served as written

## Typical cause

defineApi({ http: { mounts } }) named a primitive nothing registered, or a prefix that would shadow a framework namespace

## Fix

fix the mount named in the cause: a prefix like '/v1' (not /api or /_x), and a scopes map naming only registered actions and queries — x routes --json lists them

[HTTP](/error-codes#http)