kLSRErrorDomain Error 301

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Created Sep ’21

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I’m getting a flood of these errors in a shipping speech recognition app since users started upgrading to iOS15. It’s usually being returned by the speech recogniser a few seconds after recognition begins.

I can’t find any reference to it anywhere in Apple’s documentation. What is it?

Code: 301
Domain: kLSRErrorDomain
Description: Recognition request was canceled

Answered by 34534543456789098767654 in 689206022

Ok, after some investigation it looks like kLSRErrorDomain/301 is new in iOS15 and is reported when you cancel a speech recognition request, but only on newer devices (specifically, devices with a CoreML-compatible neural engine — A12 Bionic and newer).

So it looks like iOS15 changes the way speech recognition is handled by the neural engine, resulting in a new error code. Cancelling tasks previously seemed to result in a kAFAssistantErrorDomain/216. 216 is still present in iOS15 though, not sure on the details.

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34534543456789098767654 OP

Sep ’21

Accepted Answer

Ok, after some investigation it looks like kLSRErrorDomain/301 is new in iOS15 and is reported when you cancel a speech recognition request, but only on newer devices (specifically, devices with a CoreML-compatible neural engine — A12 Bionic and newer).

So it looks like iOS15 changes the way speech recognition is handled by the neural engine, resulting in a new error code. Cancelling tasks previously seemed to result in a kAFAssistantErrorDomain/216. 216 is still present in iOS15 though, not sure on the details.

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