OpenPublish 7 Configuration

Hello There,

I can have Drupal 7.18 installed at my server, but I thought that it would a Drupal core site not OpenPublish distribution. I installed Drupal 7.18 from my server, deleted it and installed the OpenPublish version openpublish-7.x-1.0-beta2-core.zip. I am having problems with this installation of OpenPublish but the look is exactly the same as it was the Drupal 7.18 from the server.

I downloaded OpenPublish (openpublish-7.x.1.0-beta7-core.zip), unzipped it and transferred the whole content to the server. I created a database with the admin user and open the site on the browser. Immediately it opens up a welcome page with a login panel. If I click on “create a user” I get “internal error”; if I click on “create an account” or “forgot password” I get “500 Internal Server Error (Internal Server Error: The server encountered an internal error or misconfiguration and was unable to complete your request.