Page Comparison

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1. Error: 400. That’s an error.
              origin_mismatch
   
   Solution:
   You are entering the incorrect application URL.
   
   • The URL you typed in the browser with which you are accessing Celoxis, is not the one you have entered when creating the Google client. 
     OR
   • You have not entered the correct application URL when creating the Google client. Change this to match the URL with which you access Celoxis.
   
   
   
2. Error: Invalid_client.
              no application name
   
   Solution: 
   This happens because you are using an existing project which does not have a Product Name entered. To resolve:
   

   1. Go to the Google Developers Console.

   2. Select a the project you created.

   3. From the sidebar on the left, select APIs & auth.

   4. Under this, click on the Consent screen.

   5. Select the Email address for your account.

   6. Under Product name enter a product name/name of the project.

   7. Click on Save.
      (http://stackoverflow.com/questions/18677244/error-invalid-client-no-application-name)