diff --git a/src/main/java/es/bsc/inb/ades/rest/api/services/FileServiceImp.java b/src/main/java/es/bsc/inb/ades/rest/api/services/FileServiceImp.java
index 5af3233446a4a71a98ce2da5d52a98071745ea93..d35c7d84677ab06e9b8ed6ce8756714455ff4ddd 100644
--- a/src/main/java/es/bsc/inb/ades/rest/api/services/FileServiceImp.java
+++ b/src/main/java/es/bsc/inb/ades/rest/api/services/FileServiceImp.java
@@ -184,13 +184,17 @@ public class FileServiceImp implements FileService {
 			errors.add("The following document is incomplete : " + string + ", please review that both files : "+ string +"_annotations.json and " + string + "_documents.json where included.");
 		}
 		
-		errors.addAll(validateDocumentsInDatabase(Arrays.asList(files)));
-		
-		if(!allow_duplicates) {
-			//solo se esta validando los _documents.json habria que tambien tener en cuenta los annotations.  
-			errors.addAll(validateDocumentsNamesInDatabase(Arrays.asList(files)));
+		if(errors.size()==0) {
+			errors.addAll(validateDocumentsInDatabase(Arrays.asList(files)));
+			if(!allow_duplicates) {
+				//solo se esta validando los _documents.json habria que tambien tener en cuenta los annotations.  
+				errors.addAll(validateDocumentsNamesInDatabase(Arrays.asList(files)));
+			}
 		}
 		
+		
+		
+		
 		return errors;
 		
 	}
@@ -212,8 +216,7 @@ public class FileServiceImp implements FileService {
 					errors.add("The document " + name + " has a documentId ("+doc.getLong("id")+") that was already processed and is present in the database. A document with the same documentId cannot be processed again.");
 				}
 			} catch (IOException e) {
-				// TODO Auto-generated catch block
-				e.printStackTrace();
+				errors.add("The document file " + multipartFile + " is not a valid json files for the PretoxTM system.");
 			}
 			
 		}