attempt to create a specific file system handler for the upload, i.e. extend it. there is an error i cannot solve

modules/file_upload/cms_file_upload_file.e

@@ -0,0 +1,61 @@
+note
+	description: "Summary description for {CMS_FILE_UPLOAD_FILE}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_FILE_UPLOAD_FILE
+
+inherit
+	WSF_UPLOADED_FILE
+		redefine
+			name
+		end
+
+	RAW_FILE
+		undefine
+			make, change_name, is_empty, exists
+		end
+
+create
+	make_new,
+	make_with_path
+
+feature -- Initialization
+
+	make_new (a_name: READABLE_STRING_GENERAL; a_filename: READABLE_STRING_GENERAL; a_content_type: like content_type; a_size: like size; a_user: CMS_USER)
+		local
+			time: DATE_TIME
+		do
+			new_name := a_name.as_string_32
+			url_encoded_name := url_encoded_string (a_name)
+			filename := a_filename.as_string_32
+			content_type := a_content_type
+			size := a_size
+
+			create time.make_now_utc
+			set_uploaded_time (time)
+			set_uploaded_by (a_user)
+		end
+
+feature -- Access
+
+	uploaded_by: CMS_USER
+			-- user who has uploaded the file
+
+	uploaded_time: DATE_TIME
+			-- time and date when file was uploaded
+
+feature -- Setter functions
+
+	set_uploaded_by (a_user: CMS_USER)
+		do
+			uploaded_by := a_user
+		end
+
+	set_uploaded_time (a_time: DATE_TIME)
+		do
+			uploaded_time := a_time
+		end
+end