ResourceExhausted in Google Speech API - speech-to-text

Question

this is my first post on StackOverflow. I get ResourceExhausted with Google Speech API - LongRunningRecognizeResponse. It says "e.g. check quota", but I'm not sure what it means exactly. How do I check quota and make necessary setups?
func sendRequestWithUri(uri string)
(*speechpb.LongRunningRecognizeResponse, error) {
log.Printf("Uri: %s", uri)
ctx := context.Background()
client, err := speech.NewClient(ctx)
if err != nil {
log.Fatalf("Failed to create client: %v", err)
}
// Create Request with config
req := &speechpb.LongRunningRecognizeRequest{
Config: &speechpb.RecognitionConfig{
Encoding: speechpb.RecognitionConfig_FLAC,
SampleRateHertz: 44100,
LanguageCode: "en-US",
},
Audio: &speechpb.RecognitionAudio{
AudioSource: &speechpb.RecognitionAudio_Uri{
Uri: uri,
},
},
}
log.Printf("Created request: %s", req)
op, err := client.LongRunningRecognize(ctx, req)
if err != nil {
return nil, err
}
return op.Wait(ctx)
}
The code takes the URL for a FLAC file uploaded on Google Cloud Storage. After attempts to try with files in different lengths, I always receive:
rpc error: code = ResourceExhausted desc = Resource has been exhausted (e.g. check quota).
exit status 1
Then I opened GCP console, and simply enabled Speech API on one of the projects, where I want to work with Speech API. On a local machine (macOS, bash), I have selected the target project via gcloud gcloud config configurations create myproject and gcloud auth login. It looks like project config is successfully created:
$ gcloud config list
[core]
account = mygmail
disable_usage_reporting = False
project = myproject
Your active configuration is: [myproject]
After enable and setup, I still get the same ResourceExhausted.
Do I miss anything? Thanks.