firebase-functions: Error in emulated function: Provided authentication credentials for the app named "[DEFAULT]"

Version info

**firebase-functions:^0.6.2

**firebase-tools:3.10.0

**firebase-admin:~5.2.1

node: 6.11.2

Test case

Somehow a DEFAULT is stuck when I start a new project for firebase serve --only functions It seems like firebase functions is stuck with a reference from a previous project somewhere. Setting a blank new code project and a new firebase project I cannot get it to update the database.

This error keeps popping up:

error: FIREBASE WARNING: Provided authentication credentials for the app named "[DEFAULT]" are invalid. 

However, on a fresh machine, it all works ok.

Steps to reproduce

Initialize a basic functions project (in a new firebase project)

index.js

const functions = require('firebase-functions');
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.helloWorld = functions.https.onRequest((request, response) => {
    return response.send("Hello " + request.query.name || 'No one');
});

exports.helloWrite = functions.https.onRequest((request, response) => {
    admin.database().ref("/test/x1").set({ 
        hi: request.query.name || "there",
        date: new Date().toISOString()
    }, function (err) {
        if (err) console.log(err);
        return response.send("Hello " + request.query.name || 'No one');
    });
});

Serve it

firebase serve --only functions

Test it

curl -X GET 'http://localhost:5000/live-test-49290/us-central1/helloWorld?name=Steve'
Hello Steve

All is good

Test the write

curl -X GET 'http://localhost:5000/live-test-49290/us-central1/helloWrite?name=Steve'

error: FIREBASE WARNING: Provided authentication credentials for the app named "[DEFAULT]" are invalid. This usually indicates your app was not initialized correctly. Make sure the "credential" property provided to initializeApp() is authorized to access the specified "databaseURL" and is from the correct project.

NOT so good here…

.firebaserc

{
  "projects": {
    "default": "live-test-49290"
  }
}

When I try to get a config

firebase functions:config:get
{}

I have multiple firebase logins and multiple projects in each login. Have tried firebase logout and firebase login