diff --git a/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultItemManager.java b/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultItemManager.java
index 9f47751..794b869 100644
--- a/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultItemManager.java
+++ b/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultItemManager.java
@@ -54,8 +54,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				ItemList items = response.getSource().readEntity(ItemList.class);
 			
@@ -91,8 +95,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				ItemList items = response.getSource().readEntity(ItemList.class);
 				
@@ -133,8 +141,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(Integer.class);
 			}
@@ -172,8 +184,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				Response resp = response.getSource();
 				
@@ -205,8 +221,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				ItemWrapper<Item> item = response.getSource().readEntity(ItemWrapper.class);
 				
@@ -230,8 +250,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				GXWebTargetAdapterRequest myManager = manager.path(id).path("rootSharedFolder");
 				GXInboundResponse response = myManager.get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				ItemWrapper<Item> item = response.getSource().readEntity(ItemWrapper.class);
 				
@@ -256,8 +280,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				GXWebTargetAdapterRequest myManager = manager.path(id).path("publiclink");
 				GXInboundResponse response = myManager.get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				URL item = response.getSource().readEntity(URL.class);
 				
@@ -285,8 +313,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				ItemList items = response.getSource().readEntity(ItemList.class);
 				
@@ -318,8 +350,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.post(Entity.entity(multipart, MediaType.MULTIPART_FORM_DATA));
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(String.class);
 			}
@@ -345,8 +381,12 @@ public class DefaultItemManager implements ItemManagerClient {
 
 				GXInboundResponse response = myManager.post(Entity.entity(multipart, MediaType.MULTIPART_FORM_DATA_TYPE));
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(String.class);
 
@@ -376,10 +416,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.post(Entity.entity(formData, MediaType.APPLICATION_FORM_URLENCODED));
 				
-				if (response.hasGXError() || response.hasException()) 
-					throw response.getException();
-				if (response.hasErrorCode()) 
-					throw new BackendGenericError();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(String.class);
 			}
@@ -407,8 +449,12 @@ public class DefaultItemManager implements ItemManagerClient {
 					
 					GXInboundResponse response = myManager.put(Entity.entity(multipart, MediaType.MULTIPART_FORM_DATA_TYPE));
 					
-					if (response.hasGXError()) 
-						throw response.getException();
+					if (response.isErrorResponse()) {
+						if (response.hasException()) 
+							throw response.getException();
+						else 
+							throw new BackendGenericError();
+					}
 					
 					return response.getSource().readEntity(String.class);
 				}
@@ -433,8 +479,12 @@ public class DefaultItemManager implements ItemManagerClient {
 					multipart.field("users", users, MediaType.APPLICATION_JSON_TYPE);
 					GXInboundResponse response = myManager.put(Entity.entity(multipart, MediaType.MULTIPART_FORM_DATA_TYPE));
 					
-					if (response.hasGXError()) 
-						throw response.getException();
+					if (response.isErrorResponse()) {
+						if (response.hasException()) 
+							throw response.getException();
+						else 
+							throw new BackendGenericError();
+					}
 					
 					return response.getSource().readEntity(String.class);
 				}
@@ -455,8 +505,13 @@ public class DefaultItemManager implements ItemManagerClient {
 				GXWebTargetAdapterRequest myManager = manager.path(id);
 				GXInboundResponse response = myManager.delete();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
 				return null;
 			}
 		};
@@ -480,8 +535,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.queryParams(params).get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(ItemList.class);
 			}
@@ -502,8 +561,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				GXWebTargetAdapterRequest myManager = manager.path(id).path("acls");
 				GXInboundResponse response = myManager.get();
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(ACLList.class);
 			}
@@ -531,8 +594,12 @@ public class DefaultItemManager implements ItemManagerClient {
 				
 				GXInboundResponse response = myManager.post(Entity.form(formData));
 				
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return response.getSource().readEntity(String.class);
 			}
diff --git a/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultWorkspaceManager.java b/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultWorkspaceManager.java
index cdb904f..b19d778 100644
--- a/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultWorkspaceManager.java
+++ b/src/main/java/org/gcube/common/storagehub/client/proxies/DefaultWorkspaceManager.java
@@ -12,6 +12,7 @@ import org.gcube.common.clients.Call;
 import org.gcube.common.clients.delegates.ProxyDelegate;
 import org.gcube.common.gxrest.request.GXWebTargetAdapterRequest;
 import org.gcube.common.gxrest.response.inbound.GXInboundResponse;
+import org.gcube.common.storagehub.model.exceptions.BackendGenericError;
 import org.gcube.common.storagehub.model.expressions.OrderField;
 import org.gcube.common.storagehub.model.expressions.SearchableItem;
 import org.gcube.common.storagehub.model.items.Item;
@@ -44,8 +45,12 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 
 				GXInboundResponse response = myManager.queryParams(params).get();
 
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 
 				return response.getSource().readEntity(ItemWrapper.class);
 			}
@@ -95,8 +100,13 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 
 				GXInboundResponse response = myManager.queryParams(params).get();
 
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
 				return response.getSource().readEntity(ItemList.class);
 			}
 		};
@@ -124,8 +134,14 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 
 				GXInboundResponse response = myManager.queryParams(params).get();
 
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
+				
 				return response.getSource().readEntity(ItemList.class);
 
 			}
@@ -150,8 +166,14 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 					params.put("exclude",excludeNodes);
 
 				GXInboundResponse response = myManager.queryParams(params).get();
-				if (response.hasGXError()) 
-					throw response.getException();
+				
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
 				return response.getSource().readEntity(ItemWrapper.class);
 			}
 		};
@@ -172,8 +194,14 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 
 				GXInboundResponse response = myManager.get();
 
-				if (response.hasGXError()) 
-					throw response.getException();
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
+				
 				return response.getSource().readEntity(ItemList.class);
 			}
 		};
@@ -198,8 +226,14 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 					params.put("exclude",excludeNodes);
 
 				GXInboundResponse response = myManager.queryParams(params).get();
-				if (response.hasGXError()) 
-					throw response.getException();
+				
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
 				return response.getSource().readEntity(ItemWrapper.class);
 			}
 		};
@@ -219,8 +253,13 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 				GXWebTargetAdapterRequest myManager = manager.path("trash").path("empty");
 				
 				GXInboundResponse response = myManager.delete();
-				if (response.hasGXError()) 
-					throw response.getException();
+				
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
 				
 				return null;
 			}
@@ -240,8 +279,13 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 				GXWebTargetAdapterRequest myManager = manager.path("trash").path("restore");
 				
 				GXInboundResponse response = myManager.put(Entity.text(id));
-				if (response.hasGXError()) 
-					throw response.getException();
+				
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}				
 				
 				return response.getSource().readEntity(String.class);
 			}
@@ -287,8 +331,14 @@ public class DefaultWorkspaceManager implements WorkspaceManagerClient {
 				params.put("e", new Object[] { URLEncoder.encode(serializedJson)});
 
 				GXInboundResponse response = myManager.queryParams(params).get();
-				if (response.hasGXError()) 
-					throw response.getException();
+				
+				if (response.isErrorResponse()) {
+					if (response.hasException()) 
+						throw response.getException();
+					else 
+						throw new BackendGenericError();
+				}
+				
 				return response.getSource().readEntity(ItemList.class);
 			}
 		};
diff --git a/src/test/java/org/gcube/data/access/fs/Items.java b/src/test/java/org/gcube/data/access/fs/Items.java
index 34247c6..935526a 100644
--- a/src/test/java/org/gcube/data/access/fs/Items.java
+++ b/src/test/java/org/gcube/data/access/fs/Items.java
@@ -61,8 +61,8 @@ public class Items {
 
 		String afi = null;
 
-		try(InputStream is = new FileInputStream(new File("/home/lucio/Downloads/ar_bigdata_201705.csv"))){
-			shc.getWSRoot().uploadFile(is, "bigfile1GB-test2.scv", "descr");
+		try(InputStream is = new FileInputStream(new File("/home/lucio/Downloads/TatyanaSondre.jpg"))){
+			shc.getWSRoot().uploadFile(is, "TatyanaSondre.jpg", "descr");
 
 			System.out.println(afi);
 		} catch (Exception e) {
@@ -96,9 +96,8 @@ public class Items {
 	@Test
 	public void emptyTrash() throws Exception {
 		StorageHubClient shc = new StorageHubClient();
-		shc.open("9931e1b1-e824-47b1-a30d-4e9a14e126fa").asFile().getPublicLink();
 		
-		//shc.emptyTrash();
+		shc.emptyTrash();
 
 	}