“You don’t have permission” and “Nothing here”

Hi! I’ve recently changed webhotel, and thus I’ve uploaded my database to a new MYSQl-server. The problem is that I can’t log in to the admin panel, instead I get this error:

“You don’t have permission to access /wp-admin/ on this server.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.”

I can click on the news on the site on the mainpage, but if I click on the I get the “nothing here”-error.