Mosquitto Broker error on startup

[alesoft73]

The problem

On start up the add-on receive this error

[09:18:26] ERROR: Can't setup Home Assistant service mqtt

Environment

• Add-on with the issue: Mosquitto broker
• Add-on release with the issue: Current version: 5.1.1
• Last working add-on release (if known): HA previus version 2021.2
• Operating environment (OS/Supervised): Hass OS

Problem-relevant configuration

When add-on start expose this error
[09:18:26] ERROR: Can't setup Home Assistant service mqtt

Traceback/Error logs

Only error on mosquitto broker add-on
[09:18:26] ERROR: Can't setup Home Assistant service mqtt

Additional information

Nothing

[mamos76]

i have the same kind of error.
core 2021.3.0
Supervisor 2021.03.4
Home Assistant os: 5.12

[roschi02]

I have the same error. But it is not compromising the functionality in my case

[jsb5151]

Most likely related to #1887

[cogneato]

Add-on config:

logins: []
anonymous: false
customize:
  active: false
  folder: mosquitto
certfile: fullchain.pem
keyfile: privkey.pem
require_certificate: false

Add-on logs:

[22:46:36] INFO: Setup mosquitto configuration
[22:46:36] INFO: Found local users inside config
[22:46:37] INFO: Initialize Home Assistant Add-on services
[22:46:37] ERROR: Can't setup Home Assistant service mqtt
[22:46:37] INFO: Initialize Home Assistant discovery
[22:46:37] INFO: Start Mosquitto daemon

Supervisor logs:

21-03-10 05:46:35 INFO (SyncWorker_9) [supervisor.docker.addon] Starting Docker add-on homeassistant/aarch64-addon-mosquitto with version 5.1.1
21-03-10 05:46:37 ERROR (MainThread) [supervisor.services.modules.mqtt] There is already a MQTT service in use from core_mosquitto
21-03-10 05:46:39 INFO (MainThread) [supervisor.auth] Auth request from 'core_mosquitto' for 'cogneato'

I'm seeing this as well but the broker runs as and clients connect just fine.

[realthk]

There are serious other problems with MQTT 5.1.1, as it can be seen in #1887
5.1.0 is the last stable version.

[eole210]

I started to have the same problem, herratic broker behaviour, this week, with no apparent reason. Is there a way to downgrade to 5.1 when 5.1 was never installed?
All versions are the latest and also having:
In add-on logs: ERROR: Can't setup Home Assistant service mqtt
Supervisor logs: There is already a MQTT service in use from core_mosquitto
Also to note that basic functionnality still working but as soon as I try to use a MQTT client like MQTTexplorer, all data got scrambled and restart of mosquitto is then required.

[mumblingsages]

I'm had the same error message. I rebooted my HA server and the message went away. Now however, it's not adding discovered devices to HA instance.

[adivinus]

Same problem! Was happen occasionly.

[DarthBill13]

Same error, not seeing that it affects functionality.

[alesoft73]

I have resolve to remove add-on on Home Assistant and reinstall.
Now the error is disappeared!

[raidnet-ms]

I solved this problem reinstalling the integration but it came back with latest hassio update (6.x).
Now i'm unable to solve this again.