diff --git a/src/org/gcube/vremanagement/vremodeler/impl/ModelerService.java b/src/org/gcube/vremanagement/vremodeler/impl/ModelerService.java
index 157544d..fcaed19 100644
--- a/src/org/gcube/vremanagement/vremodeler/impl/ModelerService.java
+++ b/src/org/gcube/vremanagement/vremodeler/impl/ModelerService.java
@@ -218,6 +218,8 @@ public class ModelerService {
 	 */
 	public void setCollection(CollectionArray request) throws GCUBEFault{
 		try{
+			logger.trace("method setCollection Called");
+			System.out.println("method setCollection Called");
 			DBInterface.connect();
 			DBInterface.ExecuteUpdate("DELETE FROM VRERELATEDCOLLECTION WHERE VRERELATEDCOLLECTION.vreid='"+getResource().getID()+"';");
 
@@ -233,7 +235,10 @@ public class ModelerService {
 			}
 			DBInterface.connect();
 			DBInterface.InsertInto("VRERELATEDCOLLECTION", values);
-		}catch(Exception e){throw new GCUBEFault(e);}
+		}catch(Exception e){
+			e.printStackTrace();
+			throw new GCUBEFault(e);
+		}
 
 	}
 
@@ -274,7 +279,7 @@ public class ModelerService {
 				}
 			}
 
-			if(!enter) throw new RemoteException("no collection selected for this DL");
+			if(!enter) throw new GCUBEFault("no collection selected for this VRE");
 			else preparedWhere=preparedWhere.substring(0, preparedWhere.length()-4)+") ";
 
 			totalMF = DBInterface.queryDB("select MDFORMAT.id, MDFORMAT.name, MDFORMAT.schemauri, MDFORMAT.language from MDFORMAT;");