Error: Not found when transcribing using SDK

[tazmaniax]

When I pass the config { audio: "./abc.m4a", speaker_labels: true } to client.transcripts.transcribe(config) I get the error below using v4.18.5 of the SDK. It doesn't seem to matter if it's a local file or a publicly hosted file:

Failed to process ./abc.m4a with error: Error: Not found
    at FileService.fetch (file:///Users/cwebb/Library/Caches/deno/npm/registry.npmjs.org/assemblyai/4.18.5/dist/deno.mjs:88:23)
    at eventLoopTick (ext:core/01_core.js:179:7)
    at async FileService.fetchJson (file:///Users/cwebb/Library/Caches/deno/npm/registry.npmjs.org/assemblyai/4.18.5/dist/deno.mjs:95:26)
    at async FileService.upload (file:///Users/cwebb/Library/Caches/deno/npm/registry.npmjs.org/assemblyai/4.18.5/dist/deno.mjs:752:22)
    at async TranscriptService.submit (file:///Users/cwebb/Library/Caches/deno/npm/registry.npmjs.org/assemblyai/4.18.5/dist/deno.mjs:534:32)
    at async TranscriptService.transcribe (file:///Users/cwebb/Library/Caches/deno/npm/registry.npmjs.org/assemblyai/4.18.5/dist/deno.mjs:517:28)