diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
index d8e85a6..baec3d2 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/GWTWorkspaceServiceImpl.java
@@ -686,9 +686,12 @@ public class GWTWorkspaceServiceImpl extends RemoteServiceServlet implements GWT
 						
 						NotificationsProducer np = getNotificationProducer();
 						
-						np.notifyAddedItemToSharing(listContacts, sourceItem, (WorkspaceFolder) destinationSharedFolder);	
-						
-						workspaceLogger.trace("The notifies sent correctly");
+						if(destinationSharedFolder instanceof WorkspaceSharedFolder){
+							np.notifyAddedItemToSharing(listContacts, sourceItem, (WorkspaceSharedFolder) destinationSharedFolder);
+							workspaceLogger.trace("The notifies sent correctly");
+						}
+						else
+							workspaceLogger.warn("Notifies added item: "+sourceItem+ "to share doesn't sent because "+destinationSharedFolder+" is not istance of WorkspaceSharedFolder");
 //							np.notifyAddedItemToSharing(listContacts, (WorkspaceFolder) folderDestinationItem);	
 					}	
 				}
@@ -740,10 +743,11 @@ public class GWTWorkspaceServiceImpl extends RemoteServiceServlet implements GWT
 						
 						NotificationsProducer np = getNotificationProducer();
 						
-						np.notifyMovedItemToSharing(listContacts, sourceItem, (WorkspaceFolder) sourceSharedFolder);
-						
-						workspaceLogger.trace("The notifies was sent correctly");
-						
+						if(sourceSharedFolder instanceof WorkspaceSharedFolder){
+							np.notifyMovedItemToSharing(listContacts, sourceItem, (WorkspaceSharedFolder) sourceSharedFolder);
+							workspaceLogger.trace("The notifies was sent correctly");
+						}else
+							workspaceLogger.warn("Notifies moved item: "+sourceItem+ "from share doesn't sent because "+sourceSharedFolder+" is not istance of WorkspaceSharedFolder");
 				}
 
 			}else
@@ -852,8 +856,14 @@ public class GWTWorkspaceServiceImpl extends RemoteServiceServlet implements GWT
 					if(NotificationsUtil.isASharedFolder(wsItem)){
 						notification.notifyFolderRenamed(listSharedContact, wsItem, previousName, newName, wsItem.getIdSharedFolder());
 					}else{
-						WorkspaceFolder sharedFolder = (WorkspaceFolder) workspace.getItem(wsItem.getIdSharedFolder());
-						notification.notifyItemRenamed(listSharedContact, previousName, wsItem, sharedFolder);
+						
+						//TWO CASES: EITHER ROOT FOLDER AS WorkspaceSharedFolder OR DOESN'T.
+						WorkspaceItem sharedFolder = workspace.getItem(wsItem.getIdSharedFolder());
+						if(sharedFolder instanceof WorkspaceSharedFolder)
+							notification.notifyItemRenamed(listSharedContact, previousName, wsItem, (WorkspaceSharedFolder) sharedFolder);
+						else
+							workspaceLogger.trace("Notifies for rename item itemId: "+itemId+" doesn't sent because: "+sharedFolder+" is not an instance of WorkspaceSharedFolder");
+//						notification.notifyItemRenamed(listSharedContact, previousName, wsItem, sharedFolder);
 					}
 				}catch (Exception e) {
 					workspaceLogger.error("An error occurred in checkNotify ", e);
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java b/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java
index cd5b8ea..6ce8e4c 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsProducer.java
@@ -64,7 +64,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param sharedFolder
 	 */
-	public void notifyFolderSharing(final List<InfoContactModel> listContacts, final WorkspaceFolder sharedFolder) {
+	public void notifyFolderSharing(final List<InfoContactModel> listContacts, final WorkspaceSharedFolder sharedFolder) {
 
 		new Thread(){
 			@Override
@@ -164,7 +164,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param sharedFolder
 	 */
-	public void notifyItemRenamed(final List<InfoContactModel> listSharedContact, final String previousName, final WorkspaceItem item, final WorkspaceFolder sharedFolder) {
+	public void notifyItemRenamed(final List<InfoContactModel> listSharedContact, final String previousName, final WorkspaceItem item, final WorkspaceSharedFolder sharedFolder) {
 
 		new Thread(){
 			@Override
@@ -300,7 +300,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param unSharedFolder
 	 */
-	public void notifyFolderUnSharing(final List<InfoContactModel> listContacts, final WorkspaceFolder unSharedFolder) {
+	public void notifyFolderUnSharing(final List<InfoContactModel> listContacts, final WorkspaceSharedFolder unSharedFolder) {
 
 		
 		new Thread() {
@@ -320,8 +320,7 @@ public class NotificationsProducer {
 				
 								//DEBUG
 //								System.out.println("Sending notification to user "+infoContactModel.getLogin() +" un shared folder "+unSharedFolder.getName());
-								
-								boolean notify = notificationsMng.notifyFolderRemovedUser(infoContactModel.getLogin(), unSharedFolder);
+								boolean notify = notificationsMng.notifyFolderRemovedUser(infoContactModel.getLogin(), (WorkspaceSharedFolder) unSharedFolder);
 								
 								if(!notify)
 									logger.error("An error occured when notifies user: "+infoContactModel.getLogin());
@@ -346,7 +345,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param workspaceItem
 	 */
-	public void notifyAddedItemToSharing(final List<InfoContactModel> listContacts, final WorkspaceItem workspaceItem, final WorkspaceFolder sharedFolder) {
+	public void notifyAddedItemToSharing(final List<InfoContactModel> listContacts, final WorkspaceItem workspaceItem, final WorkspaceSharedFolder sharedFolder) {
 
 		new Thread() {
 			  @Override
@@ -401,7 +400,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param workspaceItem
 	 */
-	public void notifyUpdatedItemToSharing(final List<InfoContactModel> listContacts, final WorkspaceItem workspaceItem, final WorkspaceFolder sharedFolder) {
+	public void notifyUpdatedItemToSharing(final List<InfoContactModel> listContacts, final WorkspaceItem workspaceItem, final WorkspaceSharedFolder sharedFolder) {
 
 		new Thread() {
 			  @Override
@@ -459,7 +458,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param sharedFolder
 	 */
-	public void notifyMovedItemToSharing(final List<InfoContactModel> listContacts, final WorkspaceItem workspaceItem, final WorkspaceFolder sharedFolder) {
+	public void notifyMovedItemToSharing(final List<InfoContactModel> listContacts, final WorkspaceItem workspaceItem, final WorkspaceSharedFolder sharedFolder) {
 
 		
 		new Thread() {
@@ -529,7 +528,7 @@ public class NotificationsProducer {
 	 * @param listContacts
 	 * @param sharedFolder
 	 */
-	public void notifyRemovedItemToSharing(final List<InfoContactModel> listContacts, final String itemName, final WorkspaceFolder sharedFolder) {
+	public void notifyRemovedItemToSharing(final List<InfoContactModel> listContacts, final String itemName, final WorkspaceSharedFolder sharedFolder) {
 
 		
 		new Thread() {
diff --git a/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsUtil.java b/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsUtil.java
index 064a595..dedd3c8 100644
--- a/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsUtil.java
+++ b/src/main/java/org/gcube/portlets/user/workspace/server/notifications/NotificationsUtil.java
@@ -64,14 +64,18 @@ public class NotificationsUtil {
 
 						NotificationsProducer np = new NotificationsProducer(WsUtil.getAslSession(httpSession));
 						
-						//SWITCH BEETWEEN ADDED OR UPDATED
-						if(!isOverwrite)
-							np.notifyAddedItemToSharing(listContacts, sourceItem, (WorkspaceFolder) destinationSharedFolder);	
-						else
-							np.notifyUpdatedItemToSharing(listContacts, sourceItem, (WorkspaceFolder) destinationSharedFolder);	
-						
-						
-						logger.trace("The notifies was sent correctly");
+						if(destinationSharedFolder instanceof WorkspaceSharedFolder){
+
+							//SWITCH BEETWEEN ADDED OR UPDATED
+							if(!isOverwrite)
+								np.notifyAddedItemToSharing(listContacts, sourceItem, (WorkspaceSharedFolder) destinationSharedFolder);	
+							else
+								np.notifyUpdatedItemToSharing(listContacts, sourceItem, (WorkspaceSharedFolder) destinationSharedFolder);	
+							
+							
+							logger.trace("The notifies was sent correctly");
+						}else
+							logger.trace("The notifies doesn't sent because "+destinationSharedFolder+ " is not instance of WorkspaceSharedFolder");
 //							np.notifyAddedItemToSharing(listContacts, (WorkspaceFolder) folderDestinationItem);	
 					}	
 				}
@@ -187,8 +191,13 @@ public class NotificationsUtil {
 				
 				//Notify Removed Item To Sharing?
 				if(!isRootFolderShared){
-					np.notifyRemovedItemToSharing(listContacts, oldItemName, (WorkspaceFolder) sourceSharedFolder);
-					logger.trace("The notifies was sent correctly");
+					if(sourceSharedFolder instanceof WorkspaceSharedFolder){
+						np.notifyRemovedItemToSharing(listContacts, oldItemName, (WorkspaceSharedFolder) sourceSharedFolder);
+						logger.trace("The notifies was sent correctly");
+					}
+					else
+						logger.trace("The notifies doesn't sent because "+sourceSharedFolder+ " is not instance of WorkspaceSharedFolder");
+					
 				}else{
 					//Case removed shared folder
 					np.notifySharedFolderDeleted(listContacts, oldItemName);