diff --git a/CHANGELOG.md b/CHANGELOG.md
index e3c6636..7ee7a17 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [v1.4.0-SNAPSHOT] - 2021-05-10
 
-####Enhancements
+#### Enhancements
 
 [#21379] Moved to new ws-synchronized-module-library (based on w-thredds 1.x) and performed UMA tokens "context switches"
 [#21444] Moved to maven-portal-bom >= 3.6.2-SNAPSHOT 
diff --git a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsWidget.java b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsWidget.java
index ae13bd8..45bb2a4 100644
--- a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsWidget.java
+++ b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/client/WsThreddsWidget.java
@@ -283,21 +283,29 @@ public class WsThreddsWidget implements HasWsSyncNotificationListner {
 	 * @param config the config
 	 */
 	private void performFolderSync(final WsFolder folder, WsThreddsSynchFolderConfiguration config) {
-		GWT.log("Performing doSyncFolder on: "+folder);
+		GWT.log("Performing doSyncFolder on: "+folder+" and config: "+config);
 		final Modal box = new Modal(true);
 		box.setTitle("Starting synchronization...");
 		box.hide(false);
-		LoaderIcon loader = new LoaderIcon("Inizializiting synchronization to the folder: "+folder.getFoderName());
+		final LoaderIcon loader = new LoaderIcon("Inizializiting synchronization to the folder: "+folder.getFoderName());
 		box.add(loader);
 
 		wsThreddsSyncService.doSyncFolder(folder.getFolderId(), config, new AsyncCallback<ThSyncStatus>() {
 
 			@Override
 			public void onFailure(Throwable caught) {
-				Window.alert(caught.getMessage());
+				//Window.alert(caught.getMessage());
 				viewManager.cancelMonitor(folder);
-				if(box!=null)
-					box.hide();
+				if(box!=null) {
+					try {
+						box.remove(loader);
+					}catch (Exception e) {
+
+					}
+					Alert alertError = new Alert(caught.getMessage(), AlertType.ERROR);
+					alertError.setClose(false);
+					box.add(alertError);
+				}
 
 			}
 
diff --git a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/SyncronizeWithThredds.java b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/SyncronizeWithThredds.java
index a8252f4..590f738 100644
--- a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/SyncronizeWithThredds.java
+++ b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/SyncronizeWithThredds.java
@@ -318,7 +318,7 @@ public class SyncronizeWithThredds {
 			firstSync = true;
 		} catch (Exception e) {
 			logger.error("Error on check item sync: ", e);
-			throw new Exception("Sorry an error occurred during folder publishing, refresh and try again");
+			throw e;
 		}
 
 		try {
@@ -332,8 +332,8 @@ public class SyncronizeWithThredds {
 			return workspaceThreddsSynchronizeLib.doSync(folderId);
 
 		} catch (Exception e) {
-			logger.error("Error on do sync: ", e);
-			throw new Exception(e.getMessage() + ", refresh and try again");
+			logger.error("Error on doSyncFolder for folderId: "+folderId, e);
+			throw e;
 
 		} finally {
 
diff --git a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/ThreddsWorkspaceSyncServiceImpl.java b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/ThreddsWorkspaceSyncServiceImpl.java
index 8b9f8f2..7e3bfb7 100644
--- a/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/ThreddsWorkspaceSyncServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/widgets/wsthreddssync/server/ThreddsWorkspaceSyncServiceImpl.java
@@ -197,6 +197,11 @@ public class ThreddsWorkspaceSyncServiceImpl extends RemoteServiceServlet implem
 				config = BeanConverter.toThSynchFolderConfiguration(clientConfig, folderId,
 						clientConfig.getSelectedScope().getScopeName());
 				logger.debug("Creating server config " + config);
+			}else {
+				logger.info("The config sent from client is null, Loading it from ws-thredds");
+				ThSyncFolderDescriptor descr = getSyncService().getConfiguration(folderId, false, this.getThreadLocalRequest(), user);
+				logger.info("From ws-thredds loaded the config: "+config);
+				config = descr.getConfiguration();
 			}
 
 			ThSyncStatus status = getSyncService().doSyncFolder(folderId, config, this.getThreadLocalRequest(), user);
@@ -205,7 +210,7 @@ public class ThreddsWorkspaceSyncServiceImpl extends RemoteServiceServlet implem
 			return status;
 		} catch (Exception e) {
 			logger.error("Do sync Folder error: ", e);
-			throw new Exception("Sorry, an error occurred during synchonization phase, try again later");
+			throw new Exception("Sorry, an error occurred during synchonization phase. The server encountered the error: "+e.getMessage(), e);
 		}
 	}