This error usually occurs when you have both add-ons installed and they are competing to lock the serial port. You cannot run both add-ons with the same USB controller. Double check that is not the case. See official docs: Can I switch between Z-Wave JS and Z-Wave JS UI?
Also:
This is incorrect. Are you mixing up add-ons and integrations?
If you are using HAOS, then you will install one of either the Z-Wave JS or Z-Wave JS UI add-on. If you are not using HAOS, then you install something like Z-Wave JS UI yourself (container, binary, etc.). Those provide the Z-Wave JS Server (1), which HA connects to via the Z-Wave integration (2).
https://www.home-assistant.io/integrations/zwave_js/#prerequisites
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Every installation of HA requires the integration if you wa…
Guidd for switching add-ons:
Version 1.0.0 of the Z-Wave JS core app (add-on) includes Z-Wave JS UI, so there is no longer any reason to switch apps (add-ons). Z-Wave JS official add-on to the Z-Wave JS UI HA Community add-on , without losing any downtime caused by the re-interviewing of nodes.
In this guide, Z-Wave JS UI will henceforth be abbreviated as ZUI.