Represents an error in a speech recognition system.
| NoError | No error occurred. |
| TopicLanguageNotSupported | Supplied grammar file language is not supported. |
| GrammarCompilationFailure | Speech recognition engine failed to compiled specified grammar. |
| AudioQualityFailure | Speech recognition engine failed because the audio quality was too low. |
| TimeoutExceeded | A speech recognition system has timed out. |
| NetworkFailure | Speech error occurred due to a network failure. |
| MicrophoneUnavailable | Speech error occurred because a microphone was not available. |
| UnknownError | A speech recognition system has encountered an unknown error. |