i have problem with dropbox chooser, can someone help me

everytime i get this error 

{"error": "Invalid app_key"}

how can i fix this ? i am using angular JS in my client side here is my code.

scripts,

<script type="text/javascript" src="https://www.dropbox.com/static/api/2/dropins.js" id="dropbox" data-app-key="vw2oz6a61zahabi"></script>

 html

<a ng-click="attachFromDropBox();hideUploadAttach();" style="cursor:pointer !important;">
    <md-button aria-label="Dropbox" class="md-fab btn3x_attach md-mini" title="Dropbox">
        <md-tooltip md-direction="top" md-autohide="true">
            Dropbox
        </md-tooltip>
    </md-button>
</a>

please help me with this..