30/03/12-12:12:04,416 - DEBUG : MODULE : gallery.GalleryDragAndDrop.doPost.doPost | root.MSG_GEN_PARAM_VALUE
!!! Message Error uploading files NOT INITIALIZED !!!
nested (Deepest) : 
org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is null
	at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.<init>(FileUploadBase.java:908)
	at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:331)
	at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:351)
	at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
	at com.silverpeas.util.web.servlet.FileUploadUtil.parseRequest(FileUploadUtil.java:63)
	at com.silverpeas.gallery.servlets.GalleryDragAndDrop.doPost(GalleryDragAndDrop.java:101)
	at com.silverpeas.gallery.servlets.GalleryDragAndDrop.doGet(GalleryDragAndDrop.java:85)