File copy error after activating Drupal translation

Getting the error "Filen kan ikke kopieres, fordi filen med det angivne navn ikke eksisterer. Undersøg venligst om du har angivet det korrekte filnavn." after you install and activate the Danish translation of Drupal?

• If you are on Windows: check the temporary folder setting under admin/settings/file-system. If it is set to /tmp, change it to an existing path.
• If it is set to a valid path, make sure the PHP/web server user can write to it.