moeru-ai/airi · error

Source with id ${request.sourceId} not found.

Error message

Source with id ${request.sourceId} not found.

What it means

Thrown inside the session.setDisplayMediaRequestHandler callback when desktopCapturer.getSources(request.options) returns no source whose id equals request.sourceId. The handler was registered by screenCapture.setSource; it looks up the previously-enumerated source to feed back into the display-media callback.

Source

Thrown at packages/electron-screen-capture/src/main/index.ts:242

    const { timeout } = request
    if (typeof timeout === 'number' && (timeout <= 0 || !Number.isFinite(timeout) || Number.isNaN(timeout))) {
      throw new Error('timeout must be a positive finite number')
    }

    await setSourceMutex.acquire()
    log.withFields({ windowId, windowTitle: tryWindowTitle(window, windowTitle) }).debug('setSourceMutex acquired')

    clearTimeout(setSourceMutexTimeoutHandle)
    const handle = nanoid()
    setSourceMutexTimeoutHandle = undefined
    screenCaptureSourceMutexHandle = handle

    try {
      session.setDisplayMediaRequestHandler(async (_request, callback) => {
        const sources = await desktopCapturer.getSources(request.options)
        const source = sources.find(source => source.id === request.sourceId)
        if (!source) {
          throw new Error(`Source with id ${request.sourceId} not found.`)
        }

        callback({
          video: source,
          audio: options?.loopbackWithMute ? LoopbackAudioTypes.LoopbackWithMute : LoopbackAudioTypes.Loopback,
        })
      })

      setSourceMutexTimeoutHandle = setTimeout(() => {
        if (screenCaptureSourceMutexHandle !== handle)
          return

        resetScreenCaptureSource()
        setSourceMutex.release()

        log
          .withFields({ windowId, windowTitle: tryWindowTitle(window, windowTitle) })
          .warn(

View on GitHub (pinned to 27111382b4)

Solutions

1. Re-fetch sources via getSources immediately before calling setSource and use the fresh id.
2. Match request.options types to the source type you are selecting (screen vs window).
3. Handle the error in the renderer and fall back to letting the user re-pick a source.
4. Avoid caching source ids across long periods or across display-configuration changes.

Example fix

// before
invoke(setSource, { sourceId: cachedId, options: { types: ['screen'] } })
// after
const sources = await invoke(getSources, { types: ['screen'] })
const match = sources.find(s => s.id === cachedId) ?? sources[0]
if (!match) throw new Error('no source')
invoke(setSource, { sourceId: match.id, options: { types: ['screen'] } })

// Re-fetch and confirm the source id is current before calling setSource
const sources = await invoke(screenCapture.getSources, request.options)
if (!sources.some(s => s.id === request.sourceId)) {
  throw new Error('sourceId is stale; pick a fresh source from getSources()')
}

function isKnownSource(id: string, sources: { id: string }[]): boolean {
  return sources.some(s => s.id === id)
}

try {
  await invoke(screenCapture.setSource, { sourceId, options })
} catch (error) {
  if (error instanceof Error && /Source with id .* not found/.test(error.message)) {
    // refresh and retry once with a fresh source
    const fresh = await invoke(screenCapture.getSources, options)
    await invoke(screenCapture.setSource, { sourceId: fresh[0].id, options })
  } else throw error
}

When it happens

Trigger: Renderer calls setSource with a sourceId that is stale (the source list changed between enumeration and selection), belongs to a different session, or is malformed; request.options filters (types/types) exclude the source so it is not returned.

Common situations: Source disconnected between listing and picking (display unplugged, app closed); source list cached too long in the renderer; types filter mismatch (e.g. requesting a 'window' id with types: ['screen']); cross-platform source id format differences.

Related errors

• No active source selected
• Selected source did not provide a live video track
• mutexAcquireTimeout must be a positive finite number
• initScreenCaptureForMain must be called before calling initS
• timeout must be a positive finite number

AI-assisted analysis of moeru-ai/airi@27111382b4 (2026-08-12). Data as JSON: /api/errors/f1a107790320ffc7. Report an issue: GitHub.