diff --git a/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java b/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
index 13ade42..0c8a1f5 100644
--- a/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
+++ b/src/main/java/org/gcube/portlets/user/td/gwtservice/server/TDGWTServiceImpl.java
@@ -6527,7 +6527,9 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 			OpExecutionDirector director = new OpExecutionDirector();
 			director.setOperationExecutionBuilder(opEx);
 			director.constructOperationExecution();
-			OperationExecution invocation = director.getOperationExecution();
+			
+			ArrayList<OperationExecution> invocation = director
+					.getListOperationExecution();
 
 			if (invocation == null) {
 				throw new TDGWTServiceException(
@@ -6535,7 +6537,8 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 			}
 
 			logger.debug("OperationInvocation: \n" + invocation.toString());
-			Task trTask = service.execute(invocation, tabularResourceId);
+			Task trTask = service.executeBatch(invocation, tabularResourceId);
+			
 			logger.debug("Start Task on service: TaskId " + trTask.getId());
 
 			TaskWrapper taskWrapper = new TaskWrapper(trTask,