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 013ff2e..44b36b8 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
@@ -2209,6 +2209,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 							if (task.getResult() != null) {
 								logger.debug("Task exception:"
 										+ task.getErrorCause());
+								task.getErrorCause().printStackTrace();
 								importMonitor.setError(task.getErrorCause());
 							} else {
 								logger.debug("Task exception: Error In Import");
@@ -2603,6 +2604,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 							if (task.getResult() != null) {
 								logger.debug("Task exception:"
 										+ task.getErrorCause());
+								task.getErrorCause().printStackTrace();
 								importMonitor.setError(task.getErrorCause());
 							} else {
 								logger.debug("Task exception: Error In Import");
@@ -3253,6 +3255,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							exportMonitor.setError(task.getErrorCause());
 						} else {
 							logger.debug("Task exception: Error In Export");
@@ -3432,6 +3435,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							exportMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -4073,8 +4077,9 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 					switch (changeColumnTypeMonitor.getStatus()) {
 					case FAILED:
 						if (task.getResult() != null) {
-							logger.debug("Task exception:"
+							logger.debug("Task exception: "
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							changeColumnTypeMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -4219,6 +4224,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							deleteColumnMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -4364,6 +4370,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							labelColumnMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -4509,6 +4516,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							changeTableTypeMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -4768,6 +4776,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception: "
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							deleteRowsMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -4977,6 +4986,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							duplicatesMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -5334,6 +5344,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							templateApplyMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -5517,6 +5528,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							replaceColumnMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {
@@ -5669,6 +5681,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							replaceBatchColumnMonitor.setError(new Throwable(
 									task.getErrorCause()));
 						} else {
@@ -6129,6 +6142,7 @@ public class TDGWTServiceImpl extends RemoteServiceServlet implements
 						if (task.getResult() != null) {
 							logger.debug("Task exception:"
 									+ task.getErrorCause());
+							task.getErrorCause().printStackTrace();
 							rollBackMonitor.setError(new Throwable(task
 									.getErrorCause()));
 						} else {