You must specify a valid JavaScript API Domain as part of this key's configuration. in LinkedIn

I try to create a MVC4 application with LinkedIn share option with callback option.

i refer my script in my Layout.cshtml with my app id.

  <script type="text/javascript" src="//platform.linkedin.com/in.js">
        api_key: APIkeyGOEShere
    </script>
    <script type="text/javascript">
        function testme(count) {
            alert("That document has been shared: " + count + " times");
        }
    </script>

But the firebug shows a message like below image

But i am sure my AppID is correct. I don't know what is the reason to appear this error.

Edits

I place the api_key inside the single quote

 <script type="text/javascript" src="//platform.linkedin.com/in.js">
        api_key: 'APIkeyGOEShere'
    </script>

But i get a different in firebug

Error: API Key is invalid throw new Error("API Key is invalid");

Any format need to place API key inside of the javascript.

Please help.

Your API key looks a bit short...

Did you just register your API key? According to Eugene O'Neill on this forum:

After registering an API key and specifying a valid domain, it may take up to 30 minutes for the changes to take affect, so if it doesn't work immediately, go grab a coffee and check back in a few.

Also, make sure you specified your API Domain.

He outlines the full series of steps as follows:

To register an API key:

head over to https://www.linkedin.com/secure/developer

log in and click the link to Add New Application

fill out the following info:

Company (choose from the dropdown)

Application Name (e.g. My Company Jobs)

Description (e.g. For receiving applications from job applicants)

JavaScript API Domain (this is an important step. this is the website the button will go on e.g. http://www.mycompany.com)

Application Use (select one from the list, if nothing matches your needs, choose "other")

Developer Contact Email (your email address)

Phone (a phone number you can be reached at if there are issues with the account)

check "I agree" Security text (enter the characters you see just above it)