Add Media url incorrect

OOPS?
Found the solution at http://wordpress.org/support/topic/p2-123-clicking-add-media-opens-up-error-page?replies=10

“I found an even simpler fix to this issue.

Under General Settings, you’ll see two fields. One for the wordpress address and one for the site address.

I had the same URL for both:
WordPress address (URL): http://www.sitename.com/p2
Site address (URL): http://www.sitename.com/p2

I was having the same problem with the …/p2/p2/…

Simply changing the Site address (URL) to http://www.sitename.com/

solved the problem 🙂

Best,
Jason”