LinkedIn

I cannot get LinkedIn login to work. When trying to login, it returns “HTTP 500 error”.

I have followed instructions:
To enable authentication with this provider and to register a new LinkedIn API Application, follow the steps :
1. First go to: https://www.linkedin.com/secure/developer

2. Create a new application.

3. Fill out any required fields such as the application name and description.

4. Choose Live on Live Status.

5. Once you have registered, past the created application credentials into the boxes above.

There is no mention about OAuth 2.0 string, so I typed it like to other providers (and tried without it). No help. Linkedin manual says that “LinkedIn relies on the industry standard OAuth 2.0 protocol for granting access.”

The page I need help with: [log in to see the link]