Added messagebox instead of alert in case of error on performing versioning operation

git-svn-id: http://svn.d4science-ii.research-infrastructures.eu/gcube/trunk/portlets/user/workspace@144553 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portlets/user/workspace/client/AppController.java

@@ -2060,7 +2060,7 @@ public class AppController implements SubscriberInterface {
 
 					@Override
 					public void onFailure(Throwable caught) {
-						Window.alert("error:  "+caught);
+						new MessageBoxAlert("Error", caught.getMessage(), null);
 					}
 
 					@Override
@@ -2142,7 +2142,7 @@ public class AppController implements SubscriberInterface {
 					@Override
 					public void onFailure(Throwable caught) {
 						fileVersioningEvent.getWinVersioning().unmask();
-						Window.alert("error:  "+caught);
+						new MessageBoxAlert("Error", caught.getMessage(), null);
 
 					}
 
@@ -2169,7 +2169,7 @@ public class AppController implements SubscriberInterface {
 					@Override
 					public void onFailure(Throwable caught) {
 						fileVersioningEvent.getWinVersioning().unmask();
-						Window.alert("error:  "+caught);
+						new MessageBoxAlert("Error", caught.getMessage(), null);
 
 					}