home-assistant/core · warning · ServiceValidationError

Source {source} not found

Error message

Source {source} not found

What it means

ServiceValidationError from async_select_source: the requested source name matches neither any input's text/id nor any preset name on the player. Presets take priority when names collide. The call aborts without changing playback.

Source

Thrown at homeassistant/components/bluesound/media_player.py:655

        await self._player.shuffle(shuffle)

    @override
    async def async_select_source(self, source: str) -> None:
        """Select input source."""
        if self.is_grouped and not self.is_leader:
            return

        # presets and inputs might have the same name; presets have priority
        for input_ in self._inputs:
            if source in (input_.text, input_.id):
                await self._player.play_url(input_.url)
                return
        for preset in self._presets:
            if preset.name == source:
                await self._player.load_preset(preset.id)
                return

        raise ServiceValidationError(f"Source {source} not found")

    @override
    async def async_clear_playlist(self) -> None:
        """Clear players playlist."""
        if self.is_grouped and not self.is_leader:
            return

        await self._player.clear()

    @override
    async def async_media_next_track(self) -> None:
        """Send media_next command to media player."""
        if self.is_grouped and not self.is_leader:
            return

        await self._player.skip()

    @override

View on GitHub (pinned to 58a3fdb3ea)

Solutions

1. Check the entity's source_list attribute and use one of those exact strings (or the input id)
2. If presets/inputs recently changed on the device, wait for the next coordinator refresh or call the entity's update before selecting
3. Parameterize the source name via a blueprint input or helper so renames only need one edit

Example fix

# before
- action: media_player.select_source
  target:
    entity_id: media_player.living_room
  data:
    source: Spottify

# after (match the exact name in source_list)
- action: media_player.select_source
  target:
    entity_id: media_player.living_room
  data:
    source: Spotify

def source_available(entity, source: str) -> bool:
    sources = set(entity.source_list or [])
    inputs = {i.text for i in entity._inputs} | {i.id for i in entity._inputs}
    presets = {p.name for p in entity._presets}
    return source in sources or source in inputs or source in presets

from homeassistant.exceptions import ServiceValidationError
try:
    await entity.async_select_source(source)
except ServiceValidationError as err:
    if "not found" in str(err):
        # refresh source_list and prompt user to pick a valid source

When it happens

Trigger: Calling media_player.select_source with a name that is not in the player's current inputs list or presets list — e.g. a source removed on the device, a typo, or a source list that has not synced yet after startup.

Common situations: Automation hardcodes a source name the user later renamed in the Bluesound app; source selected right after HA restart before the coordinator fetched inputs/presets; using the input's URL/id instead of its display text.

Related errors

• Cannot join player to itself
• config_entry_not_loaded
• Failed to set temperature to {temperature}.
• Failed to set value.
• code_arm_required

AI-assisted analysis of home-assistant/core@58a3fdb3ea (2026-08-14). Data as JSON: /api/errors/342d3615a8e63d43. Report an issue: GitHub.