Firebase: Firebase App named '[DEFAULT]' already exists (app/duplicate-app)." about polycasts HOT 17 OPEN

On firebase web, you check if already initialized with:

if (!firebase.apps.length) {
firebase.initializeApp({});
}

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Environment:
Ubuntu 16,04
Node: v7.5.0
Firebase tools: 3.4.0
Google Chrome 56.0.2924.87

Clues:
Something in my browser messing it up, It worked in incognito... >_>

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Does CTRL+F5 actually clear the cache before reloading? Try opening DevTools, then right-click the refresh button, and choose "Empty cache and hard reload". http://superuser.com/questions/220179/how-can-i-do-a-cache-refresh-in-google-chrome

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the issue is due to calling the initialize method of firebase more than multiple times . me had this same issue . and i could fix it by restricting the initialize method call more than once . make the firebase configurations in one class and make it as singleton class .

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This happens if you leave out or misspell an import. It also seems to happen if the name starts with "main" as in "main-page" or "main-view" for polymer elements. Not sure why, but I was able to take the exact same file, and rename it to "view-main" and it started working.

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I had a similar error. My imports were:

<script src="/__/firebase/4.0.0/firebase-app.js"></script>
<script src="/__/firebase/4.0.0/firebase-auth.js"></script>
<script src="/__/firebase/4.0.0/firebase-database.js"></script>
<script src="/__/firebase/4.0.0/firebase-messaging.js"></script>
<script src="/__/firebase/init.js"></script>

<!-- AngularJS -->
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.1/angular.min.js"></script>

<!-- Firebase -->
<script src="https://www.gstatic.com/firebasejs/3.6.6/firebase.js"></script>

<!-- AngularFire -->
<script src="https://cdn.firebase.com/libs/angularfire/2.3.0/angularfire.min.js"></script>

<!-- app script -->
<script src="app.js"></script>

I changed the firebase.js cdn to 4.0.0 and it fixed the "Firebase app [DEFAULT] already exists" error.

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Duplicate imports, might be looping (I had some issues right now with it too, (again)) but it went away after double checking everything. (you also get the error message if you load polymer in the same document as polymerfire

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It gave me that error too when missing importing things, (was doing polycast #58 and forgot to bower install iron-icons and was giving me very vague errors like poster)

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Nevermind, I have no idea, stuck at same thing, around the last steps at the tutorial I broke mine aswell, trouble figuring it out

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trying to figure this out, so far I narrowed it down to notes.html
If I comment out

<!-- <link rel="import" href="bower_components/polymerfire/firebase-query.html"> -->
<!-- <link rel="import" href="bower_components/paper-input/paper-input.html"> -->
<!-- <link rel="import" href="bower_components/paper-icon-button/paper-icon-button.html"> -->
<!-- <link rel="import" href="bower_components/iron-icons/iron-icons.html"> -->

I don't get errors

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@RStyrman I can't reproduce your symptoms (no errors for me using original code from ep58-firebase-db-demo). Can you provide details about your environment and steps to reproduce? Here's my info for comparison:

Steps

1. Run the following commands:

git clone https://github.com/Polymer/polycasts.git
cd polycasts/ep58-firebase-db-demo
bower i
firebase serve

2. Open Chrome 56 to http://localhost:5000, click SIGN IN, login, add a note, and verify it looks similar to this screenshot:

3. Open console in DevTools, and verify there are no warnings/errors.

Environment

• macOS Sierra 10.12
• Chrome 56.0.2924.87 (64-bit)
• node 7.6.0
• firebase-tools 3.4.0

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works for me now too.. I must have messed something up

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something is up, so I got the error again, firebase serve second time (I did get it to work on first try)

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I really don't know what's going on, I tried disabling all my extensions and I refresh the cache by using ctrl + f5, it works in incognito and not in non incognito

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your right, it didn't me 🐌

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I was having the exact same problem. Following RStyrman, I removed some of the imports which helped me figure out that the error was that I didn't have paper-input installed in the bower_components directory. It makes no sense to me why that gave me a "firebase app already exists" error, but installing paper-input (bower install --save PolymerElements/paper-input) fixed the error.

The demo is all working now. I'm sure that exact thing isn't everyone's problem, but I guess the bigger lesson is that error does not necessarily have anything to do with firebase.

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Right-clicking on the browser's refresh icon and selecting "hard refresh and clear cache" is what solved my problem with this error. Try running your app on incognito or using the refresh before jumping to some of the conclusions on here. I spent at least forty minutes going through every file before doing the refresh.

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