Google Assistant: required key not provided

Hi, I’ve split the google_assistant away for them the confguration.yaml file, but I get an error:

 Invalid config for [google_assistant]: required key not provided @ data['google_assistant']['project_id']. Got None. (See ?, line ?). 

Directory and files are nested as:

tts/google_assistant
-google_assistant.yaml
-service_account.json

Any help would be appreciated, thanks