title: drupal 7 error when uploading with new field
body: <p>I've got a very strange problem using drupal 7. I've got a wbesite running and using views and content types I have been able to build a lot of functionality. Now the following occurs:</p>
  
  <p>When I add a new field to a content type (new or existing) of the the type file or image, I have this field in the form but when I try to upload a file or image using this form it gives an error "The file could not be uploaded" or the full error (from the recent log messages): "The upload directory public:// for the file field field_katapult_voorpagina could not be created or is not accessible. A newly uploaded file could not be saved in this directory as a consequence, and the upload was canceled."</p>
  
  <p>Strangely, when I upload a file or image using an older existing field (pointing to the same directory: public://) it does not give an error and the files upload without a problem. So this makes me think that the server settings are actually set properly.</p>
  
  <p>Anybody who can help me with this problem?
  If not, can anybody point me in the right direction as to where I can find the files that handle the upload process in drupal 7?</p>
  
  <p>Many thanks in advance!</p>