Error 2 UNKNOWN ERROR?

[FezVrasta]

Hi, I'm getting this error after I speak to the assistant.

Ready
[1] { wrappers_: null,
[1]   messageId_: undefined,
[1]   arrayIndexOffset_: -1,
[1]   array: [ 14, 'Service unavailable.', [] ],
[1]   pivot_: 1.7976931348623157e+308,
[1]   convertedFloatingPointFields_: {} }
[1] Error ocurred. Exiting...
[1] Assistant Finished Speaking
[1] { Error: 2 UNKNOWN: Unknown Error.
[1]     at createStatusError (/Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:64:15)
[1]     at ClientDuplexStream._emitStatusIfDone (/Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:270:19)
[1]     at ClientDuplexStream._receiveStatus (/Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:248:8)
[1]     at /Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:804:12
[1]   code: 2,
[1]   metadata: Metadata { _internal_repr: { 'content-disposition': [Array] } },
[1]   details: 'Unknown Error.' }
[1] { Error: 2 UNKNOWN: Unknown Error.
[1]     at createStatusError (/Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:64:15)
[1]     at ClientDuplexStream._emitStatusIfDone (/Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:270:19)
[1]     at ClientDuplexStream._receiveStatus (/Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:248:8)
[1]     at /Users/federicozivolo/Progetti/mac-google-assistant/node_modules/grpc/src/client.js:804:12
[1]   code: 2,
[1]   metadata: Metadata { _internal_repr: { 'content-disposition': [Array] } },
[1]   details: 'Unknown Error.' }
[1] Error ocurred. Exiting...
[1] Error ocurred. Exiting...

I'm not sure if it's the same as #6 because the error looks different.

My code is here in case you'd like to give it a look
https://github.com/FezVrasta/google-assistant-mac

May you help me to understand what's wrong?