Index: lams_tool_assessment/web/pages/monitoring/statistic.jsp
===================================================================
diff -u -r53be6f88884b380ccb963eb05c985a57f580b5d4 -raee02778beae3a5f21631c6c4092d75ff318e326
--- lams_tool_assessment/web/pages/monitoring/statistic.jsp	(.../statistic.jsp)	(revision 53be6f88884b380ccb963eb05c985a57f580b5d4)
+++ lams_tool_assessment/web/pages/monitoring/statistic.jsp	(.../statistic.jsp)	(revision aee02778beae3a5f21631c6c4092d75ff318e326)
@@ -21,6 +21,9 @@
 					if (json.success == "true") {
 						alert("<fmt:message key='label.tool.output.has.been.changed'/>");
 					}
+				},
+				error: function (xhr, ajaxOptions, thrownError) {
+					alert("<fmt:message key='label.operation.failed'/>");
 				}
 			});
 		});